AP Stats Chapters

Here is the dot plot of voter turnout (as a percentage of voting-age population) for the 50 states—plus the District of Columbia—in a recent presidential election. Which of the following best describes this distribution?

• The distribution of voter turnout is skewed slightly left, centered at about 62%, with a range of 24%.
• The distribution of voter turnout is roughly symmetric, centered at about 60%, with a range of 30%.
• The distribution of voter turnout is skewed slightly right, centered at about 62%, with a range of 24%.
• The distribution of voter turnout is bimodal, centered at about 60%, with a range of 30%.

The stem-and-leaf diagram below gives the distribution of the ages in years of 20 participants at a family reunion. Which of the following statements about the distribution is correct?

• The first quartile is larger than the third quartile.
• The distribution is strongly skewed to the left.
• It makes the most sense to use the mean and standard deviation as a numerical summary of the center and spread of this distribution.
• The mean is larger than the median.

According to the 1.5 x IQR rule, how many outliers are there in the data set 72, 110, 114, 115, 118, 123, 144, 156?

• None
• One
• Two
• Three

The histogram shows the typical travel time to school (self-reported) for 50 high school students. Which of the following statements is true about the mean and median of this distribution?

• Mean > Median
• Mean < Median
• Mean = Median
• Mean ≈ Median

A zoologist studying adult bears measures a number of different variables. Which of the possible variables is categorical (qualitative)?

• the weight in pounds of an adult bear
• the level of aggression (low, moderate, high) displayed by an adult bear
• the number of fish an adult bear eats in a particular day

Jerome’s summer reading list has 8 books, and he is examining the number of pages in each book. After calculating the mean, median, standard deviation, and interquartile range, he realized that the longest book is actually 100 pages longer than he thought it was. Which of his measurements does he need to recalculate?

• All his measurements.
• The mean, standard deviation, and interquartile range.
• The mean and standard deviation.
• Only the mean.

The following bar graph gives the percent of owners of three brands of trucks who are satisfied with their truck. What is wrong with the way information is presented in this graph?

• There should be a title and a variable label on the horizontal scale.

• The vertical scale should begin at 0 so the Chevrolet bar doesn't look disproportionately larger than Ford and Toyota.

• The vertical scale should have been measured in number of owners satisfied instead of percent of owners satisfied.

• This information should have been displayed in a pie chart.

Which of the following is NOT true?

• There are two outliers in the data.
• The median IQ score is 100.
• The IQR is 40.
• 25% of IQ scores are below 93.

When a distribution is skewed, which measures of center and spread are most reliable?

• Mean and standard deviation
• Mean and IQR
• Median and standard deviation
• Median and IQR

15 people took a CPR test. What was the median score?

• 5-10
• 10-15
• 15-20
• 20-25