Question

Phoebe surveyed teens and adults to find the average number of hours of sleep they get during the week. Her results are shown below. Which statement regarding her survey results is true?

Hours of Sleep for Teens
A box-and-whisker plot. The number line goes from 1 to 12. The whiskers range from 2.5 to 12, and the box ranges from 5 to 8.5. A line divides the box at 7.

Hours of Sleep for Adults
A box-and-whisker plot. The number line goes from 1 to 12. The whiskers range from 3 to 11, and the box ranges from 5 to 7.5. A line divides the box at 7.

Adults get more hours of sleep on average than teens.
Adults have less variability in the hours of sleep.
Teens have less variability in the hours of sleep.
Teens get less sleep on average than adults.

Answer 1

B

Explanation:

Answer 2

Adults have less variability in the hours of sleep.

Explanation:

The IQR for adults (the size of the box) is smaller than the one for teens.

A and D are wrong. Both teens and adults average seven hours of sleep.

C is wrong. Teens have greater variability in the hours of sleep.