College Political Science Quiz: Correlation Vs Causation

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Correlation Vs CausationQuestion 1 of 20

A comparative analysis finds that federal states (countries with a formal division of power between central and regional governments) have, on average, higher levels of ethnic conflict than unitary states. A scholar concludes that federalism causes ethnic conflict by institutionalizing and hardening ethnic divisions. Which of the following is a plausible confounding factor that challenges this conclusion?

Federalism is often adopted in countries that already have deep ethnic divisions, as a political compromise to hold the country together.

Unitary states are often smaller and more ethnically homogeneous, making both unitary governance and ethnic peace easier to maintain.

The level of ethnic conflict can be difficult to measure objectively, leading to potential bias in the data.

The economic resources controlled by the regional governments in federal states can become a source of contention among ethnic groups.

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College Political Science Quiz

College Political Science Quiz: Correlation Vs Causation

Practice Correlation Vs Causation 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 Correlation Vs Causation, giving you a quick way to practice the rules, question types, and explanations that matter most for College Political Science.

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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

Federalism is often adopted in countries that already have deep ethnic divisions, as a political compromise to hold the country together. (correct answer)
Unitary states are often smaller and more ethnically homogeneous, making both unitary governance and ethnic peace easier to maintain.
The level of ethnic conflict can be difficult to measure objectively, leading to potential bias in the data.
The economic resources controlled by the regional governments in federal states can become a source of contention among ethnic groups.

Explanation: This is a problem of selection bias. The choice to adopt a federal system is not random. Countries with significant, pre-existing ethnic cleavages are more likely to choose federalism precisely to manage those tensions. In this case, the pre-existing ethnic diversity is the confounder: it leads to the adoption of federalism (the IV) and is also the underlying cause of ethnic conflict (the DV). This makes it seem like federalism is causing the conflict when it might simply be a response to it. (B) is a similar and related point but (A) more directly states the selection effect. (D) describes a potential mechanism through which federalism might exacerbate conflict, which would support the scholar's claim. (C) is a measurement critique, not a confounding issue.

Question 2

A study of international relations finds that when two countries increase their bilateral trade volume, the likelihood of them going to war with each other in the following decade decreases. The 'commercial peace' theory argues this is because trade creates economic interdependence, which makes war too costly. Which of the following, if true, would suggest the observed correlation is caused by a confounding factor?

The increase in trade is primarily in non-strategic goods like textiles and agricultural products.
Pairs of countries that are both established democracies are more likely to both trade heavily with each other and remain at peace. (correct answer)
In several historical cases, major trading partners have gone to war with each other despite high trade volumes.
The economic benefits of trade are often distributed unevenly within each country, creating domestic political tensions.

Explanation: This question asks to identify a confounder for the 'commercial peace' theory. The confounder must cause both increased trade and a decreased likelihood of war. Joint democratic governance (B) is the classic alternative explanation. The 'democratic peace' theory argues that democracies are unlikely to fight each other. It is also true that democracies are more likely to trade with each other due to shared norms, trust, and legal systems. Therefore, democracy could be causing both increased trade and peace, making the relationship between trade and peace spurious. (A) and (D) discuss aspects of the trade relationship but don't introduce a third variable that causes both trade and peace. (C) provides counterexamples, which may weaken the theory, but it doesn't offer a systematic, confounding explanation for the observed overall correlation.

Question 3

A political scientist finds that when the Supreme Court's public approval rating is high, its rulings are more likely to be successfully implemented by federal agencies. She concludes that high public approval causes greater compliance. An alternative explanation is that a third variable is at play. Which of the following is the most plausible confounding variable?

The political party of the sitting President.
The ideological alignment between the median justice on the Court and the prevailing national mood. (correct answer)
The number of amicus curiae briefs filed in the cases being decided.
The legal complexity of the Court's written opinions in its rulings.

Explanation: A plausible confounder must affect both the independent variable (Court's approval) and the dependent variable (implementation). The ideological alignment between the Court and the national mood (B) does this effectively. When the Court is in sync with the public's general ideology, its approval rating is likely to be high. Simultaneously, federal agencies, being part of a government that is also responsive to the national mood, are more likely to be ideologically aligned with the rulings and implement them successfully. This creates the observed correlation without requiring a direct causal link from approval to compliance. (A) is a plausible factor, but the broader 'national mood' is a more encompassing confounder. (C) and (D) are features of the cases themselves and are less likely to systematically drive both public approval and agency compliance.

Question 4

A political scientist observes that in the United States, states with higher per-capita ice cream consumption have higher rates of voter turnout in presidential elections. Concluding that ice cream consumption boosts civic engagement is flawed. What is the most likely confounding variable responsible for this spurious correlation?

State population density, which affects both food distribution networks and the concentration of polling places.
Average state temperature, as warmer states may have both higher ice cream sales and cultural norms that encourage community activities.
The level of political polarization in a state, as highly contested elections could drive up both stress-eating and voter participation.
Median age of the state's population, since older populations might consume less ice cream and also vote at different rates than younger populations. (correct answer)

Explanation: The most plausible confounder is the median age of the population. Older citizens have significantly higher rates of voter turnout, and they may consume ice cream at different rates (possibly lower) than younger populations. This third variable affects both of the observed variables. (A) and (B) are less direct; while temperature might affect ice cream sales, its link to turnout is tenuous. (C) is a creative but less likely explanation; the link between polarization and ice cream consumption is highly speculative compared to the well-established relationship between age and voting.

Question 5

A study of 20 democracies reveals that countries with higher levels of female representation in their national legislatures also tend to have more comprehensive environmental protection laws. An analyst claims that electing more women causes stronger environmental policy. This conclusion is questionable primarily because it may overlook which of the following?

The fact that many environmental laws are difficult to enforce effectively regardless of legislative support.
The possibility that countries with progressive social values are more likely to both elect women and support environmentalism. (correct answer)
Evidence that female legislators, once in office, prioritize social welfare policies over environmental ones.
The potential for reverse causation, where a country's commitment to environmentalism creates a political climate favorable to electing female candidates.

Explanation: This question asks the test-taker to identify a classic confounding variable. Progressive social values (the confounder) could independently cause both higher female representation (the independent variable) and stronger environmental laws (the dependent variable). This would create a spurious, non-causal relationship. (A) discusses policy implementation, which is a separate issue from policy formation and does not challenge the causal link. (C) offers a counter-argument about legislative priorities but doesn't address the methodological reason why the observed correlation might not be causal. (D) suggests reverse causation, which is a plausible alternative, but the presence of a strong underlying societal value system is a more comprehensive and common explanation for this type of macro-level correlation.

Question 6

Federalism is often adopted in countries that already have deep ethnic divisions, as a political compromise to hold the country together. (correct answer)
Unitary states are often smaller and more ethnically homogeneous, making both unitary governance and ethnic peace easier to maintain.
The level of ethnic conflict can be difficult to measure objectively, leading to potential bias in the data.
The economic resources controlled by the regional governments in federal states can become a source of contention among ethnic groups.

Question 7

A regression analysis of campaign spending and election outcomes in U.S. House races shows that the candidate who spends more money wins the election approximately 90% of the time. A pundit argues this proves that money is the deciding factor in politics. A political scientist would be most likely to challenge this conclusion by pointing out that:

The analysis fails to account for the impact of presidential coattails in election years.
Donors are strategic and tend to give more money to candidates who are already likely to win, such as popular incumbents. (correct answer)
The study does not differentiate between spending on positive advertising and negative attack ads.
The 10% of cases where the lower-spending candidate wins are significant outliers that disprove the general trend.

Explanation: The correct answer identifies a critical confounding factor and selection effect. The perceived viability or likelihood of winning is a confounder. It influences both how much money a candidate can raise (donors flock to likely winners) and the ultimate election outcome. This makes it appear that money is causing the win, when in fact the likelihood of winning is causing both. This is a more fundamental challenge to the causal claim than the others. (A) identifies a possible omitted variable, but it's less central than candidate viability. (C) relates to the mechanism of spending, not whether spending is causal in the first place. (D) misunderstands statistical analysis; a 90% correlation is very strong, and outliers do not invalidate it, though the inference drawn from it can be flawed.

Question 8

A researcher observes that politicians who use humor more frequently in their public speeches tend to have higher approval ratings. The researcher suspects this correlation is spurious. To test for the influence of a confounding variable, which research design would be most effective?

Conducting a content analysis of politicians' speeches to categorize the different types of humor used.
Surveying voters to ask them directly if a politician's use of humor affects their approval.
Comparing the approval ratings of a single politician before and after they began a new strategy of using more humor.
Statistically comparing the approval ratings of humorous and non-humorous politicians while controlling for their underlying charisma and public speaking skill. (correct answer)

Explanation: The most likely confounder is a politician's overall charisma or public speaking ability. A charismatic politician is likely to be skilled at using humor effectively and likely to have high approval ratings for reasons independent of the humor itself. The best way to test this is to statistically control for this third variable (D). By comparing humorous and non-humorous politicians who have similar levels of charisma, the researcher can isolate the specific effect of humor. (A) analyzes the independent variable in more detail but doesn't address the confounder. (B) relies on self-reporting, which can be unreliable. (C) is a better design (a before-and-after study) but is still susceptible to other events causing the change in approval; controlling for the confounder directly is a more robust approach.

Question 9

A study finds that individuals who report getting most of their political news from social media are more likely to believe in political conspiracies than those who rely on traditional newspapers. If a researcher wishes to test whether a confounding variable is responsible for this correlation, which of the following variables would be most crucial to control for in their statistical model?

The individual's annual income level.
The number of hours per day the individual spends consuming any form of media.
The individual's pre-existing level of trust in government institutions. (correct answer)
The region of the country where the individual resides.

Explanation: This is a case of self-selection bias driven by a confounding variable. A pre-existing low level of trust in institutions (the confounder) could lead an individual to both avoid traditional news sources (like newspapers associated with the 'establishment') in favor of social media, and to be more receptive to conspiracy theories. Controlling for this variable is essential to isolate the true effect of social media. (A), (B), and (D) are plausible demographic or behavioral controls, but none is as directly and theoretically linked to both the choice of media and the belief in conspiracies as pre-existing institutional trust.

Question 10

A study using aggregate data from all 50 U.S. states finds that states with a higher percentage of citizens of immigrant origin have lower rates of violent crime. A senator cites this study to argue that immigration causes a reduction in crime. Why is this conclusion, drawn from this specific data, potentially an example of the ecological fallacy?

The study does not differentiate between documented and undocumented immigrants in its analysis.
The observed state-level correlation may be driven by immigrants moving to economically vibrant states that have declining crime rates for other reasons. (correct answer)
The study uses FBI crime statistics, which are known to have inconsistencies in reporting across different states.
The study should have been conducted over a longer time period to establish a clear temporal relationship.

Explanation: The ecological fallacy occurs when an inference about individuals is drawn from aggregate-level data. The state-level correlation could be misleading. Option (B) points this out perfectly by identifying a confounding variable at the state level (economic vibrancy) that influences both where immigrants choose to settle and the crime rate. It could be that in these prosperous states, native-born citizens are committing fewer crimes, and this effect is stronger than any effect from the immigrant population. The aggregate data masks these individual-level dynamics, making the senator's causal claim about immigrants themselves suspect. (A), (C), and (D) are all valid methodological critiques, but they don't describe the ecological fallacy, which is specifically about the error of moving from aggregate to individual-level inference.

Question 11

A city government experiments with a new community policing program in one high-crime district. After a year, the crime rate in that district has fallen by 15%. The city council declares the program a success and moves to implement it city-wide. Which of the following potential confounding factors represents a 'history' threat to the council's conclusion?

The police officers assigned to the experimental district were veterans with higher-than-average performance records.
During the same year, a large local factory closed, leading to a significant increase in unemployment across the entire city.
During the same year, a national law was passed that provided significant funding for community-led youth programs in high-crime areas nationwide. (correct answer)
The districts not chosen for the program had, on average, slightly lower crime rates to begin with.

Explanation: A 'history' threat refers to an external event that occurs at the same time as the treatment (the policing program) and could also affect the outcome (the crime rate). The passage of the national law (C) is a perfect example. It's an external event that provides an alternative explanation for the drop in crime in the district, confounding the effect of the community policing program. (A) describes a selection bias, not a history threat. (B) describes an event that would likely increase crime, so it doesn't explain the observed decrease. (D) describes a potential baseline difference, which is a problem for comparison, but not a history threat.

Question 12

A political scientist analyzes historical data and finds a correlation between the expansion of a country's railroad network and its subsequent democratization. They theorize that railroads foster a national identity and connect dissident groups, causing democratic change. Which of the following discoveries would most strongly suggest that a confounding variable is at play?

In several countries, democratization occurred decades after the main phase of railroad construction was completed.
The political regimes that built the railroads were often authoritarian and were trying to strengthen central control, not promote democracy.
Railroad expansion often involved taking land from indigenous groups, leading to localized anti-government sentiment.
The process of industrialization tended to occur at the same time as railroad expansion and also created new social classes that demanded political representation. (correct answer)

Explanation: When analyzing correlations in political science research, you must always consider whether a third variable might be causing both observed phenomena—this is called a confounding variable. The researcher observes that railroad expansion correlates with democratization and theorizes a causal relationship, but correlation doesn't prove causation. Answer D identifies the strongest confounding variable: industrialization. If industrialization drives both railroad construction AND creates new social classes demanding political representation, then industrialization—not railroads themselves—could be the true cause of democratization. This would make the railroad-democracy correlation spurious, meaning it exists only because both variables are caused by the same underlying factor. Answer A suggests timing issues but doesn't eliminate the causal relationship—delayed effects are common in political processes and don't necessarily indicate confounding. Answer B describes the motivations of authoritarian regimes but doesn't provide an alternative explanation for democratization itself; unintended consequences can still create causal relationships. Answer C mentions localized anti-government sentiment from land seizures, but this describes a direct effect of railroad construction rather than suggesting an alternative cause for broader democratization patterns. The key insight is that industrialization represents a comprehensive economic and social transformation that could plausibly drive both infrastructure development (railroads) and political change (democratization) independently. This makes it a classic confounding variable. Remember: when evaluating causal claims in political science, always ask whether a broader underlying process could be driving multiple observed changes simultaneously.

Question 13

A researcher finds a strong positive correlation between the number of public libraries per capita in a city and its average citizen satisfaction score. The researcher concludes that building more libraries causes an increase in citizen satisfaction. Which of the following, if true, would most seriously weaken this causal conclusion?

The study controlled for city population size but not for median household income. (correct answer)
Citizen satisfaction was measured using a survey with a known margin of error of +/- 3%.
The positive correlation was weaker for cities with populations over one million.
Further analysis reveals that increased library usage leads to higher literacy, which in turn boosts satisfaction.

Explanation: The correct answer identifies a potential confounding variable. Higher median income could independently lead to both more public funding for amenities like libraries and higher levels of citizen satisfaction, creating a spurious correlation. Not controlling for income is a major flaw. (B) mentions measurement error, which is a potential issue in any study but doesn't address the specific causal claim's primary weakness. (C) describes a moderating effect, where the relationship changes under different conditions, but it doesn't invalidate the underlying causal claim, only specifies its scope. (D) describes a mediating variable (literacy) and a causal mechanism, which would actually strengthen the researcher's conclusion, not weaken it.

Question 14

A researcher is studying the relationship between political knowledge and the use of lawn signs for political candidates in a suburban community. The researcher finds a positive correlation: households with a political lawn sign are, on average, able to answer more questions correctly on a political knowledge quiz.

Based on the passage, the researcher concludes that the act of displaying a lawn sign causes homeowners to become more politically informed, perhaps to defend their choice to neighbors. Which of the following statements identifies the most likely confounder and the reason it is a confounder?

The cost of the lawn sign is the confounder because the ability to afford a sign is also related to higher education levels, which in turn leads to more political knowledge.
The candidate on the sign is the confounder because supporters of some candidates may be more knowledgeable than supporters of others, regardless of the sign itself.
The homeowner's level of political engagement is the confounder because highly engaged individuals are more likely to both display a sign and actively seek out political information. (correct answer)
The neighborhood's average income is the confounder because wealthier neighborhoods may have more social pressure to display signs and also have residents with more leisure time to study politics.

Explanation: The most direct confounder is a person's pre-existing level of political engagement. A highly engaged person is predisposed to both perform an expressive political act (displaying a sign) and to be politically knowledgeable. The engagement is the common cause of both observed phenomena, making the correlation between the sign and knowledge spurious. (A) and (D) propose plausible confounders (wealth/education), but political engagement (C) is a more proximate and direct cause for both specific behaviors. (B) describes a potential difference between groups but doesn't explain the correlation itself as effectively as the underlying trait of engagement.

Question 15

A study shows a positive correlation between the number of journalists a country has per capita and its level of government accountability. A causal conclusion that more journalists lead to more accountability is challenged by the possibility of a confounding variable. Which of the following variables is conceptually distinct from a confounder in this context?

A high level of economic development, which can support a large media market and a well-funded civil service.
A strong societal commitment to freedom of speech, which encourages both journalism as a profession and demands for accountability.
Increased media reports on corruption, which leads to public outcry, forcing politicians to become more accountable. (correct answer)
The presence of robust, independent legal institutions, which protect journalists and also adjudicate accountability claims.

Explanation: This question requires distinguishing a confounding variable from a mediating variable. A confounder is a common cause of both the IV and DV. A mediator is part of the causal pathway between the IV and DV. Options (A), (B), and (D) are all plausible confounders—they could cause both a rise in the number of journalists and an increase in accountability. Option (C), however, describes a mechanism or mediating variable. It suggests the pathway is: more journalists (IV) -> more reports on corruption (mediator) -> more accountability (DV). Because it describes the process through which the causal relationship might work, it strengthens the original causal claim rather than challenging it as spurious.

Question 16

The fact that many environmental laws are difficult to enforce effectively regardless of legislative support.
The possibility that countries with progressive social values are more likely to both elect women and support environmentalism. (correct answer)
Evidence that female legislators, once in office, prioritize social welfare policies over environmental ones.
The potential for reverse causation, where a country's commitment to environmentalism creates a political climate favorable to electing female candidates.

Question 17

A researcher analyzes data from 50 countries and finds a negative correlation between a country's average tariff rate and its score on a democratic index. The researcher concludes that protectionist trade policies erode democracy. Which of the following describes a plausible alternative explanation involving reverse causation?

Countries with strong democratic institutions are more likely to have powerful consumer lobbies that advocate for lower tariffs and free trade. (correct answer)
A third factor, such as a country's integration into the global economy, promotes both democratic norms and lower tariff rates.
The implementation of low tariffs leads to economic growth, which in turn provides the resources for democratic consolidation.
The democratic index used by the researcher is flawed and does not accurately measure the true level of democracy in a country.

Explanation: Reverse causation means the presumed dependent variable is actually causing the presumed independent variable. In this case, it would mean that the level of democracy (DV) is causing the tariff rate (IV). Choice (A) provides a clear mechanism for this: established democracies have interest groups (consumer lobbies) that successfully push for lower tariffs. This reverses the causal arrow proposed by the researcher. (B) describes a confounding variable, not reverse causation. (C) describes a mediating variable (economic growth), which supports the researcher's original causal direction. (D) points to a measurement error, which is a different type of methodological critique.

Question 18

The study does not differentiate between documented and undocumented immigrants in its analysis.
The observed state-level correlation may be driven by immigrants moving to economically vibrant states that have declining crime rates for other reasons. (correct answer)
The study uses FBI crime statistics, which are known to have inconsistencies in reporting across different states.
The study should have been conducted over a longer time period to establish a clear temporal relationship.

Question 19

The increase in trade is primarily in non-strategic goods like textiles and agricultural products.
Pairs of countries that are both established democracies are more likely to both trade heavily with each other and remain at peace. (correct answer)
In several historical cases, major trading partners have gone to war with each other despite high trade volumes.
The economic benefits of trade are often distributed unevenly within each country, creating domestic political tensions.

Question 20

In several countries, democratization occurred decades after the main phase of railroad construction was completed.
The political regimes that built the railroads were often authoritarian and were trying to strengthen central control, not promote democracy.
Railroad expansion often involved taking land from indigenous groups, leading to localized anti-government sentiment.
The process of industrialization tended to occur at the same time as railroad expansion and also created new social classes that demanded political representation. (correct answer)