# HiSET: Math : Recognize possible associations and trends in data

## Example Questions

### Example Question #2 : Data Analysis, Probability, And Statistics

The revenue of a small company over 10 years is portrayed by the following line graph.

Which of the following statements can best be made about the data?

The company's revenue generally decreased from 1994 to 1996.

The company had the highest revenue in the year 1994.

The revenue in the 10 years was generally decreasing each year.

The revenue in the 10 years was generally increasing each year.

The company's revenue increased from 1991 to 1993.

The company's revenue generally decreased from 1994 to 1996.

Explanation:

The question asks you to identify a trend that best fits the data.

Over 10 years, the revenue of the company decreases and increases with no clear overall pattern or trend, so the answers claiming that there is a general increase or decrease are incorrect.

While the revenue was at a high point ($65,000) in the year 1994, it was not the highest point in the 10 years. The highest point was in 1998, with a revenue of$77,000.

While the revenue did increase from 1991 to 1992, it decreased by even more from 1991 to 1993. Therefore, from 1991 to 1993, there was actually a net decrease in revenue, not a net increase.

The correct answer is: "The company's revenue generally decreased from 1994 to 1996." Notice the data points matching the years 1994, 1995, and 1996 are linked by a line that has a downward slope. This indicates a general decrease in revenue.

### Example Question #1 : Recognize Possible Associations And Trends In Data

An individual's income over 10 years is represented by the following line chart.

Approximate individual's highest annual income from 1994 to 1998.

$210,000$500

$460,000$460

$500,000 Correct answer:$460,000

Explanation:

Notice that the question narrows the time period you are examining to 1994–1998. While there are years with higher incomes than in this time period (namely, 1992 and 1999), we can only consider the years from 1994 to 1998.

The highest point within this period is in the year 1998. Matching this data point with the values on the y-axis (the income values), you will see that this data point lies between $400,000 and$500,000. Looking more closely, you can even say that it is above halfway between the values, so it appears to be greater than $450,000. Thus, the value that approximates the income in 1998 is$460,000.

Be careful to take into account the units on each axis. The y-axis measures income in thousands of dollars, so the answer is $460,000 and not$460.

### Example Question #1 : Recognize Possible Associations And Trends In Data

Which of these data sets would be best represented using a line graph?

The decrease in weight of a dieting adult male over the last 12 months

The average amount spent on groceries per week by families of different income levels.

The current population numbers of different cities in the United States

The distribution of various weekly expenditures of an average middle class American family.

The distribution of ages of employees at a software company

The decrease in weight of a dieting adult male over the last 12 months

Explanation:

The line graph is best used with data that occurs sequentially, especially sequentially over a period of time. The line graph is best at describing a general trend, such as an increase or decrease, over time.

The decrease in weight of an adult male over 12 months fits a line graph well because there is data that can be organized sequentially (chronologically, in this case) and because we would be looking for some sort of trend in the data, a decrease over time in this case.

### Example Question #5 : Data Analysis, Probability, And Statistics

The approximate salaries of employees in a company are given by the histogram below:

Using the data presented in the histogram, determine what percentage of employees earn a weekly salary of $180,000 or more. Possible Answers: Correct answer: Explanation: Each bar in this histogram represent the percent of employees with salary in the given range. For example, the bar above the label "150–159" means that 25% of the employees earn between$150,000 and $159,000. Since we want the percent of employees who earn$180,000 or more, we need to add the values for the bars for "180–189", "190–199", and "200–210".

The bars show that 15% of employees earn between  $180,000 and$189,000, 15% earn between $190,000 and$199,000, and 5% earn between $200,000 and$210,000.

Adding these percentages together yields 35%.

### Example Question #3 : Recognize Possible Associations And Trends In Data

The yearly revenue over 10 years of a company is given by the following graph.

Using the graph, determine the approximate revenue in the year 2004.