College Political Science Quiz: Variables And Causal Mechanisms
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Variables And Causal MechanismsQuestion 1 of 20

A study on the causes of terrorism hypothesizes that high levels of youth unemployment create a large pool of disaffected individuals who are susceptible to recruitment by terrorist organizations. The study design proposes to compare the rates of terrorist activity in countries with different levels of youth unemployment.

Which of the following, if true, would most seriously challenge the proposed causal mechanism of this study?

Terrorist organizations primarily recruit well-educated individuals from middle-class backgrounds.
Countries with high youth unemployment often have weak state security apparatuses.
Terrorist activity is difficult to measure accurately across different countries.
Youth unemployment rates are positively correlated with a country's overall poverty level.
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College Political Science Quiz

College Political Science Quiz: Variables And Causal Mechanisms

Practice Variables And Causal Mechanisms in College Political Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Variables And Causal Mechanisms, giving you a quick way to practice the rules, question types, and explanations that matter most for College Political Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A study on the causes of terrorism hypothesizes that high levels of youth unemployment create a large pool of disaffected individuals who are susceptible to recruitment by terrorist organizations. The study design proposes to compare the rates of terrorist activity in countries with different levels of youth unemployment.

Which of the following, if true, would most seriously challenge the proposed causal mechanism of this study?

  1. Terrorist organizations primarily recruit well-educated individuals from middle-class backgrounds. (correct answer)
  2. Countries with high youth unemployment often have weak state security apparatuses.
  3. Terrorist activity is difficult to measure accurately across different countries.
  4. Youth unemployment rates are positively correlated with a country's overall poverty level.
Explanation: The proposed causal mechanism is that unemployment leads to disaffection, which makes youth vulnerable to recruitment. This mechanism relies on the assumption that terrorist recruits are, in fact, drawn from the pool of unemployed and disaffected youth. If evidence shows that recruits are actually educated and middle-class, this directly contradicts and undermines the specific process outlined in the hypothesis, even if a correlation between unemployment and terrorism exists for other reasons. B suggests a confounding variable (weak states), which is a valid critique of the overall research design but is less specific to the recruitment mechanism. C points to a measurement issue with the dependent variable, not a flaw in the causal mechanism. D suggests a correlation with another variable (poverty), but doesn't directly challenge the recruitment story.

Question 2

A researcher is studying the effects of campaign finance reform. The hypothesis is that limiting corporate donations to political campaigns will reduce legislative focus on corporate interests. The study plans to compare the number of pro-business bills introduced in a legislature before and after a donation limit is enacted. A critic argues that any observed change might not be due to the reform itself, but rather to a simultaneous shift in public opinion against corporate influence, which affects both the passage of the reform and the behavior of legislators.

The critic's argument raises a concern about a potential...

  1. confounding variable. (correct answer)
  2. lack of a dependent variable.
  3. reverse causation relationship.
  4. mediating mechanism.
Explanation: When analyzing research design in political science, you need to identify threats to internal validity—factors that might undermine your ability to establish a true causal relationship between your independent and dependent variables. The critic is pointing out that a third factor (shifting public opinion against corporate influence) might be causing both the campaign finance reform AND the change in legislative behavior. This makes it impossible to determine whether the reform itself caused the change in pro-business legislation, or whether both changes resulted from the underlying shift in public sentiment. This is a classic confounding variable—an unmeasured factor that influences both your presumed cause and your outcome, creating a spurious relationship. Looking at the wrong answers: Choice B is incorrect because the study clearly has a dependent variable (number of pro-business bills). Choice C misidentifies the problem—reverse causation would mean the outcome (fewer pro-business bills) caused the reform, but the critic is suggesting a third factor causes both. Choice D is wrong because a mediating mechanism would be part of the causal pathway between reform and legislative behavior, not an alternative explanation that undermines the relationship entirely. Study tip: When evaluating research design questions, always ask yourself: "What else could explain this relationship?" Confounding variables are among the most common threats to validity in observational studies. Look for scenarios where multiple changes happen simultaneously—often one unmeasured factor is driving all the observed changes, making causal inference difficult.

Question 3

A researcher theorizes that get-out-the-vote (GOTV) phone calls increase voter turnout. The theory specifies that the calls are effective only among individuals who have weak partisan attachments. For strong partisans, who are already highly likely to vote, the calls have no effect. The researcher plans to conduct an experiment where some voters receive calls and others do not, and then compare turnout rates while analyzing the results separately for strong and weak partisans.

In this theory, an individual's strength of partisan attachment serves as...

  1. the primary independent variable.
  2. the main dependent variable.
  3. a mediating variable that explains how GOTV calls work.
  4. a moderating variable that conditions the effect of the calls. (correct answer)
Explanation: A moderating variable is one that alters the relationship between an independent variable (IV) and a dependent variable (DV). Here, the independent variable is the GOTV call, and the dependent variable is turnout. The strength of partisan attachment conditions the effect of the IV on the DV: the calls work for weak partisans but not for strong partisans. This is the definition of a moderator. A is incorrect; the primary IV is receiving a GOTV call. B is incorrect; the DV is voter turnout. C is incorrect because a mediator would be a step in the causal chain (e.g., call -> feeling of civic duty -> voting). Partisanship is a pre-existing condition that changes the nature of the relationship.

Question 4

To test whether mandatory voting laws increase political knowledge, a scholar compares political knowledge test scores in Australia (which has mandatory voting) and New Zealand (which does not). The scholar finds that Australians have slightly higher scores and concludes that the law causes citizens to become more informed. However, the study does not account for the fact that Australia has a higher per-capita GDP and a more centralized education system than New Zealand.

The unexamined differences in GDP and education systems represent a potential threat to the study's causal inference primarily due to...

  1. the ecological fallacy.
  2. omitted variable bias. (correct answer)
  3. low external validity.
  4. selection on the dependent variable.
Explanation: Omitted variable bias occurs when a statistical model leaves out a relevant variable that is correlated with both the independent variable and the dependent variable. Here, GDP and education system (the omitted variables) could be correlated with both the presence of mandatory voting (IV) and citizens' political knowledge (DV). By not controlling for these factors, the estimated effect of the law may be biased. A is incorrect; the ecological fallacy is about making inferences about individuals from aggregate data. C is incorrect; external validity concerns the generalizability of the findings, not the internal causal claim. D is incorrect; selection on the dependent variable involves choosing cases to study based on the outcome, which is not the primary flaw here.

Question 5

A study observes a strong positive correlation between the number of public libraries in a city and its crime rate. A pundit argues that libraries must be attracting criminal elements, thus causing an increase in crime. A political scientist critiques this conclusion, suggesting that a third factor, city population size, is responsible for the observed correlation.

In the political scientist's critique, what is the role of 'city population size'?

  1. An independent variable that causes libraries but not crime.
  2. A dependent variable caused by both libraries and crime.
  3. A confounding variable that makes the original relationship spurious. (correct answer)
  4. A causal mechanism that explains how libraries cause crime.
Explanation: A confounding variable is an extraneous variable that is associated with both the independent and dependent variables and can create a spurious (false) association. Here, the political scientist argues that larger city populations lead to both more libraries (IV) and more crime (DV). Population size is the common cause that explains the correlation, making the original claim that libraries cause crime spurious. A is incorrect because a confounder must affect both variables. B is incorrect as population size is the cause, not the effect. D is incorrect because the scientist is arguing against a causal mechanism, proposing a confounder instead.

Question 6

A study on legislative productivity proposes that when the same party controls both the presidency and the Congress (unified government), more landmark legislation is passed. The causal mechanism offered is that unified government reduces 'gridlock' by aligning the policy preferences of the executive and legislative branches, which streamlines the process of negotiation and passing bills.

Which of the following correctly identifies the independent variable (IV) and dependent variable (DV) in this study?

  1. IV: Reduction of gridlock; DV: Alignment of policy preferences.
  2. IV: Amount of landmark legislation passed; DV: State of government (unified or divided).
  3. IV: Alignment of policy preferences; DV: Amount of landmark legislation passed.
  4. IV: State of government (unified or divided); DV: Amount of landmark legislation passed. (correct answer)
Explanation: The study hypothesizes that the state of government (the cause) affects legislative productivity (the effect). Therefore, the independent variable is whether the government is unified or divided. The dependent variable is the outcome being measured, which is the amount of landmark legislation passed. A misidentifies the causal mechanism (reduction of gridlock) and part of the mechanism (preference alignment) as the IV and DV. B incorrectly reverses the roles of the independent and dependent variables. C incorrectly identifies a component of the causal mechanism as the independent variable.

Question 7

A study investigates the relationship between judicial independence and foreign direct investment (FDI). The theory posits that greater judicial independence leads to higher levels of FDI. The proposed causal mechanism is that independent courts are better able to credibly enforce contracts and protect property rights, which reduces the risk for foreign investors.

Which of the following best describes the role of 'contract enforcement and property rights protection' in this theory?

  1. It is the primary independent variable being tested.
  2. It is the main dependent variable the theory seeks to explain.
  3. It is a confounding variable that creates a spurious relationship.
  4. It is the causal mechanism linking the independent and dependent variables. (correct answer)
Explanation: The causal mechanism is the process or pathway through which an independent variable produces a change in a dependent variable. Here, judicial independence (IV) is said to increase FDI (DV) because it improves contract enforcement and property rights protection. This makes it the intervening process, or causal mechanism. A is incorrect because the independent variable is judicial independence. B is incorrect because the dependent variable is the level of foreign direct investment. C is incorrect because a confounding variable would influence both the IV and DV independently (e.g., overall level of economic development). Here, it's presented as part of the causal chain.

Question 8

A researcher posits that a president's public approval rating is driven by the state of the national economy. To test this, the researcher tracks presidential approval and the unemployment rate over several decades. A consistent negative correlation is found: when unemployment is high, approval is low. The researcher concludes that perceptions of economic hardship directly cause citizens to disapprove of the president's performance.

Which of the following alternative explanations represents a challenge of 'reverse causation' to the researcher's conclusion?

  1. A president's policy choices influence the unemployment rate, and these same choices also independently affect their approval rating.
  2. Low presidential approval leads to a loss of business confidence, which in turn causes firms to lay off workers and increases unemployment. (correct answer)
  3. Media coverage of the economy, not the economy itself, is the true driver of both public opinion about the economy and presidential approval.
  4. Voters' partisan affiliations determine their approval of the president, regardless of how the economy is performing.
Explanation: Reverse causation would mean that the presumed dependent variable (presidential approval) is actually causing the presumed independent variable (unemployment). Choice B proposes exactly this: low approval (the supposed effect) causes a loss of confidence, which then causes higher unemployment (the supposed cause). This flips the causal arrow from the original hypothesis. A describes a confounding variable (policy choices) that affects both the IV and DV. C suggests a different causal mechanism (media coverage) rather than reversing the original one. D proposes an alternative independent variable (partisanship) that overrides the economic factor.

Question 9

A study on the causes of terrorism hypothesizes that high levels of youth unemployment create a large pool of disaffected individuals who are susceptible to recruitment by terrorist organizations. The study design proposes to compare the rates of terrorist activity in countries with different levels of youth unemployment.

Which of the following, if true, would most seriously challenge the proposed causal mechanism of this study?

  1. Terrorist organizations primarily recruit well-educated individuals from middle-class backgrounds. (correct answer)
  2. Countries with high youth unemployment often have weak state security apparatuses.
  3. Terrorist activity is difficult to measure accurately across different countries.
  4. Youth unemployment rates are positively correlated with a country's overall poverty level.
Explanation: The proposed causal mechanism is that unemployment leads to disaffection, which makes youth vulnerable to recruitment. This mechanism relies on the assumption that terrorist recruits are, in fact, drawn from the pool of unemployed and disaffected youth. If evidence shows that recruits are actually educated and middle-class, this directly contradicts and undermines the specific process outlined in the hypothesis, even if a correlation between unemployment and terrorism exists for other reasons. B suggests a confounding variable (weak states), which is a valid critique of the overall research design but is less specific to the recruitment mechanism. C points to a measurement issue with the dependent variable, not a flaw in the causal mechanism. D suggests a correlation with another variable (poverty), but doesn't directly challenge the recruitment story.

Question 10

A theory of civil war onset suggests that 'state capacity' is a crucial factor. The argument is that states with low capacity—meaning they are unable to effectively project power, collect taxes, and provide public services throughout their territory—create opportunities for rebel groups to emerge and challenge the state. Specifically, low tax-collection ability and poor infrastructure in remote regions allow rebels to operate with impunity.

In this theory, what is the dependent variable?

  1. The emergence of rebel groups. (correct answer)
  2. The level of state capacity.
  3. The state's tax-collection ability.
  4. The quality of infrastructure in remote regions.
Explanation: When analyzing theories in political science, you need to distinguish between independent variables (causes) and dependent variables (effects or outcomes). The dependent variable is what the theory is trying to explain—the phenomenon that changes in response to other factors. This theory aims to explain why civil wars begin. The core argument is that low state capacity creates conditions where rebel groups can emerge and challenge the government. The theory treats "the emergence of rebel groups" as the outcome that needs explaining, making this the dependent variable. Civil war onset (rebel group emergence) is what varies and what the theory seeks to predict based on state capacity levels. Looking at the wrong answers: Option B (level of state capacity) is actually the independent variable—it's the causal factor that influences whether rebels emerge. The theory argues that low state capacity leads to civil war, so state capacity is doing the explaining, not being explained. Option C (tax-collection ability) is a component or indicator of state capacity, making it part of the independent variable as well. It's one mechanism through which low state capacity enables rebel activity. Option D (infrastructure quality) is similarly a component of state capacity and another mechanism that affects rebel opportunities, but it's not the main outcome the theory explains. Remember this pattern: in causal theories, identify what phenomenon the researchers are trying to explain or predict—that's your dependent variable. Everything that supposedly influences or causes that outcome represents independent variables.

Question 11

A researcher argues that decentralizing political power to regional governments increases government accountability. The argument states that local officials have better information about citizen needs and that citizens can more easily monitor these officials' performance. This increased monitoring ability allows citizens to more effectively sanction poor performance in local elections.

What is the primary causal mechanism proposed in this argument?

  1. The improved ability of citizens to monitor and sanction officials. (correct answer)
  2. The overall level of government accountability.
  3. The act of decentralizing political power.
  4. The presence of regional governments as a political structure.
Explanation: When analyzing arguments in political science, you need to distinguish between causal mechanisms (the "how" or process by which change occurs) and outcomes, structures, or initial conditions. The causal mechanism is the specific process that links cause to effect. In this decentralization argument, the researcher proposes a chain of reasoning: decentralization → better local information + easier citizen monitoring → more effective sanctioning of poor performance → increased accountability. The key causal mechanism here is citizens' enhanced ability to monitor and sanction officials, which is the process that actually produces the desired outcome of accountability. This makes A correct—it identifies the specific mechanism through which decentralization is supposed to work. Let's examine why the other options miss the mark. B identifies "government accountability" as the mechanism, but this is actually the outcome or dependent variable that the argument is trying to explain, not the process causing it. C points to "decentralizing political power" as the mechanism, but this is the initial condition or independent variable—the starting point of the causal chain, not the process linking cause to effect. D focuses on "regional governments as a political structure," but this describes an institutional arrangement rather than the dynamic process that creates change. Remember this pattern: causal mechanisms are active processes that connect inputs to outputs. Look for verbs and dynamic relationships (like "monitoring" and "sanctioning") rather than static conditions, structures, or end results when identifying how one variable influences another.

Question 12

A scholar observes that countries that have experienced a civil war are significantly more likely to experience another one within a decade of the first one ending. The proposed explanation is that the initial war destroys state institutions, creates enduring social cleavages, and leaves a proliferation of weapons and trained fighters, all of which lower the threshold for a return to violence.

In this explanation, 'the destruction of state institutions' is best understood as...

  1. the independent variable.
  2. the dependent variable.
  3. an indicator of a causal mechanism. (correct answer)
  4. a confounding variable.
Explanation: The independent variable is the experience of a prior civil war, and the dependent variable is the recurrence of civil war. The explanation for how the first war leads to the second involves several processes, or mechanisms. The destruction of state institutions is one component of this mechanism, as it helps explain why conflict is more likely to recur. It is an indicator or part of the overall causal mechanism linking past and future conflict. A is incorrect; the IV is the prior war itself. B is incorrect; the DV is the subsequent war. D is incorrect; it's not a confounder but part of the causal path from the first war.

Question 13

A political scientist hypothesizes that in developing countries, increased access to mobile internet facilitates the organization of social movements. They argue that this occurs because widespread internet access reduces the costs of communication and coordination among potential protestors, making collective action more likely. The study proposes to compare protest rates in regions before and after the rollout of 3G mobile networks.

In the researcher's proposed causal model, what is the independent variable?

  1. The reduction in communication and coordination costs
  2. The rate of social movement formation
  3. The rollout of 3G mobile networks (correct answer)
  4. The likelihood of collective action
Explanation: The independent variable (IV) is the factor that is manipulated or hypothesized to be the cause. In this model, the researcher is examining the effect of the rollout of 3G networks (the cause) on social movements (the effect). Therefore, the rollout of 3G networks is the independent variable. A is incorrect because the reduction in costs is the causal mechanism, the process through which the IV affects the dependent variable. B is incorrect because the rate of social movement formation is the dependent variable, the outcome being explained. D is incorrect because the likelihood of collective action is part of the dependent variable, representing the outcome of interest.

Question 14

A study investigates the relationship between judicial independence and foreign direct investment (FDI). The theory posits that greater judicial independence leads to higher levels of FDI. The proposed causal mechanism is that independent courts are better able to credibly enforce contracts and protect property rights, which reduces the risk for foreign investors.

Which of the following best describes the role of 'contract enforcement and property rights protection' in this theory?

  1. It is the primary independent variable being tested.
  2. It is the main dependent variable the theory seeks to explain.
  3. It is a confounding variable that creates a spurious relationship.
  4. It is the causal mechanism linking the independent and dependent variables. (correct answer)
Explanation: The causal mechanism is the process or pathway through which an independent variable produces a change in a dependent variable. Here, judicial independence (IV) is said to increase FDI (DV) because it improves contract enforcement and property rights protection. This makes it the intervening process, or causal mechanism. A is incorrect because the independent variable is judicial independence. B is incorrect because the dependent variable is the level of foreign direct investment. C is incorrect because a confounding variable would influence both the IV and DV independently (e.g., overall level of economic development). Here, it's presented as part of the causal chain.

Question 15

A study on international conflict finds that pairs of democratic states are highly unlikely to go to war with one another. A proposed explanation, known as the 'democratic culture' theory, argues that this is because democracies resolve internal disputes through non-violent compromise and negotiation. This normative practice is then externalized to foreign policy, leading democratic leaders to expect and prefer peaceful resolutions with other like-minded states.

In the 'democratic culture' explanation for democratic peace, what is the independent variable?

  1. The externalization of domestic norms to foreign policy.
  2. The joint democratic status of a pair of states (dyad). (correct answer)
  3. The absence of war between a pair of states.
  4. The practice of non-violent internal conflict resolution.
Explanation: The independent variable is the main causal factor. The overarching theory of democratic peace seeks to explain the absence of war (DV) by looking at the regime type of the states involved. Therefore, the independent variable is the joint democratic status of the state dyad. The theory then proposes a mechanism to explain this relationship. A is part of the causal mechanism, not the IV. C is the dependent variable, the outcome to be explained. D is also part of the causal mechanism, the specific norm that is externalized.

Question 16

A researcher is studying the effects of campaign finance reform. The hypothesis is that limiting corporate donations to political campaigns will reduce legislative focus on corporate interests. The study plans to compare the number of pro-business bills introduced in a legislature before and after a donation limit is enacted. A critic argues that any observed change might not be due to the reform itself, but rather to a simultaneous shift in public opinion against corporate influence, which affects both the passage of the reform and the behavior of legislators.

The critic's argument raises a concern about a potential...

  1. confounding variable. (correct answer)
  2. lack of a dependent variable.
  3. reverse causation relationship.
  4. mediating mechanism.
Explanation: When analyzing research design in political science, you need to identify threats to internal validity—factors that might undermine your ability to establish a true causal relationship between your independent and dependent variables. The critic is pointing out that a third factor (shifting public opinion against corporate influence) might be causing both the campaign finance reform AND the change in legislative behavior. This makes it impossible to determine whether the reform itself caused the change in pro-business legislation, or whether both changes resulted from the underlying shift in public sentiment. This is a classic confounding variable—an unmeasured factor that influences both your presumed cause and your outcome, creating a spurious relationship. Looking at the wrong answers: Choice B is incorrect because the study clearly has a dependent variable (number of pro-business bills). Choice C misidentifies the problem—reverse causation would mean the outcome (fewer pro-business bills) caused the reform, but the critic is suggesting a third factor causes both. Choice D is wrong because a mediating mechanism would be part of the causal pathway between reform and legislative behavior, not an alternative explanation that undermines the relationship entirely. Study tip: When evaluating research design questions, always ask yourself: "What else could explain this relationship?" Confounding variables are among the most common threats to validity in observational studies. Look for scenarios where multiple changes happen simultaneously—often one unmeasured factor is driving all the observed changes, making causal inference difficult.

Question 17

To test whether mandatory voting laws increase political knowledge, a scholar compares political knowledge test scores in Australia (which has mandatory voting) and New Zealand (which does not). The scholar finds that Australians have slightly higher scores and concludes that the law causes citizens to become more informed. However, the study does not account for the fact that Australia has a higher per-capita GDP and a more centralized education system than New Zealand.

The unexamined differences in GDP and education systems represent a potential threat to the study's causal inference primarily due to...

  1. the ecological fallacy.
  2. omitted variable bias. (correct answer)
  3. low external validity.
  4. selection on the dependent variable.
Explanation: Omitted variable bias occurs when a statistical model leaves out a relevant variable that is correlated with both the independent variable and the dependent variable. Here, GDP and education system (the omitted variables) could be correlated with both the presence of mandatory voting (IV) and citizens' political knowledge (DV). By not controlling for these factors, the estimated effect of the law may be biased. A is incorrect; the ecological fallacy is about making inferences about individuals from aggregate data. C is incorrect; external validity concerns the generalizability of the findings, not the internal causal claim. D is incorrect; selection on the dependent variable involves choosing cases to study based on the outcome, which is not the primary flaw here.

Question 18

A theory of civil war onset suggests that 'state capacity' is a crucial factor. The argument is that states with low capacity—meaning they are unable to effectively project power, collect taxes, and provide public services throughout their territory—create opportunities for rebel groups to emerge and challenge the state. Specifically, low tax-collection ability and poor infrastructure in remote regions allow rebels to operate with impunity.

In this theory, what is the dependent variable?

  1. The emergence of rebel groups. (correct answer)
  2. The level of state capacity.
  3. The state's tax-collection ability.
  4. The quality of infrastructure in remote regions.
Explanation: When analyzing theories in political science, you need to distinguish between independent variables (causes) and dependent variables (effects or outcomes). The dependent variable is what the theory is trying to explain—the phenomenon that changes in response to other factors. This theory aims to explain why civil wars begin. The core argument is that low state capacity creates conditions where rebel groups can emerge and challenge the government. The theory treats "the emergence of rebel groups" as the outcome that needs explaining, making this the dependent variable. Civil war onset (rebel group emergence) is what varies and what the theory seeks to predict based on state capacity levels. Looking at the wrong answers: Option B (level of state capacity) is actually the independent variable—it's the causal factor that influences whether rebels emerge. The theory argues that low state capacity leads to civil war, so state capacity is doing the explaining, not being explained. Option C (tax-collection ability) is a component or indicator of state capacity, making it part of the independent variable as well. It's one mechanism through which low state capacity enables rebel activity. Option D (infrastructure quality) is similarly a component of state capacity and another mechanism that affects rebel opportunities, but it's not the main outcome the theory explains. Remember this pattern: in causal theories, identify what phenomenon the researchers are trying to explain or predict—that's your dependent variable. Everything that supposedly influences or causes that outcome represents independent variables.

Question 19

A researcher posits that a president's public approval rating is driven by the state of the national economy. To test this, the researcher tracks presidential approval and the unemployment rate over several decades. A consistent negative correlation is found: when unemployment is high, approval is low. The researcher concludes that perceptions of economic hardship directly cause citizens to disapprove of the president's performance.

Which of the following alternative explanations represents a challenge of 'reverse causation' to the researcher's conclusion?

  1. A president's policy choices influence the unemployment rate, and these same choices also independently affect their approval rating.
  2. Low presidential approval leads to a loss of business confidence, which in turn causes firms to lay off workers and increases unemployment. (correct answer)
  3. Media coverage of the economy, not the economy itself, is the true driver of both public opinion about the economy and presidential approval.
  4. Voters' partisan affiliations determine their approval of the president, regardless of how the economy is performing.
Explanation: Reverse causation would mean that the presumed dependent variable (presidential approval) is actually causing the presumed independent variable (unemployment). Choice B proposes exactly this: low approval (the supposed effect) causes a loss of confidence, which then causes higher unemployment (the supposed cause). This flips the causal arrow from the original hypothesis. A describes a confounding variable (policy choices) that affects both the IV and DV. C suggests a different causal mechanism (media coverage) rather than reversing the original one. D proposes an alternative independent variable (partisanship) that overrides the economic factor.

Question 20

A researcher studying the impact of foreign aid on democratization runs a statistical analysis and finds a positive correlation between the amount of democracy-focused aid a country receives and its democracy score five years later. The researcher claims the aid is causing democratization. However, the model does not account for the fact that donor countries may preferentially give democracy aid to countries that are already showing signs of liberalizing and are thus more likely to democratize anyway.

This critique highlights a problem of...

  1. measurement error in the democracy score.
  2. endogeneity due to selection effects. (correct answer)
  3. low statistical power.
  4. a poorly specified causal mechanism.
Explanation: Endogeneity refers to a situation where the independent variable is correlated with the error term in a model. This often happens due to selection effects, where the factors determining which units receive the 'treatment' (democracy aid) are also correlated with the outcome (democratization). The critique suggests that countries are not randomly receiving aid; they are selected based on their pre-existing potential for democratization. This non-random selection makes it impossible to isolate the causal effect of the aid itself. A is a potential but different problem concerning data quality. C relates to the ability to detect an effect if one exists, not the validity of the causal claim. D is incorrect because a mechanism is implied (aid supports democratic actors); the problem is whether the correlation is causal at all.