Q: Suppose the bar graph shows the number of students in each interval of hours spent playing video games. If you want to estimate the proportion of students who play more than 15 hours, which calculation is correct?

$$\frac{\text{Number of students in 15-20 and 20-25 intervals}}{\text{Total number of students}}$$

Question 1

Which of the following best describes the type of graph used to display the 2018 Winter Olympics gold medal wins by the top 20 medal-winning countries (leftmost graph)?

Accepted Answer

Dot plot

Question 2

In the dot plot of gold medal wins, what is the mode of the distribution?

Accepted Answer

The number of gold medals that appears most frequently

Question 3

The bar graph in the center shows hours spent playing video games on weekends. Which measure of center would be most affected if one student reported playing 50 hours instead of the maximum shown?

Accepted Answer

Mean

Question 4

Which of the following is a possible reason for using a stemplot (rightmost graph) instead of a histogram?

Accepted Answer

A stemplot preserves the original data values

Question 5

Suppose the bar graph shows the number of students in each interval of hours spent playing video games. If you want to estimate the proportion of students who play more than 15 hours, which calculation is correct?

Accepted Answer

$$\frac{	ext{Number of students in 15-20 and 20-25 intervals}}{	ext{Total number of students}}$$

Question 6

If the stemplot shows the ages of 15 students, which measure can be easily identified from the plot?

Accepted Answer

Median

Question 7

Which of the following statements is true about the distribution of gold medal wins in the dot plot?

Accepted Answer

The distribution is skewed to the right

Question 8

If you wanted to compare the spread of hours spent playing video games, which measure would be most appropriate?

Accepted Answer

Range

Question 9

Given the stemplot, what is the minimum value in the data set?

Accepted Answer

The smallest leaf on the smallest stem

Question 10

Which of the following best describes the variable shown in the bar graph of hours spent playing video games?

Accepted Answer

Continuous quantitative variable

Introductory Statistics Study Guide: Sampling, Descriptive Statistics, Probability, and Random Variables

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