The amount of television viewed by today's youth is of primary concern to Parents Against Watching Television (PAWT). 300 parents of elementary school-aged children were asked to estimate the number of hours per week that their child watches television. The mean and the standard deviation for their responses were 18 and 5, respectively. PAWT constructed a stem-and-leaf display for the data that showed that the distribution of times was a symmetric, mound-shaped distribution. Give an interval where you believe approximately 95% of the television viewing times fell in the distribution.
A) between 8 and 28 hours per week
B) less than 13 and more than 23 hours per week
C) between 3 and 33 hours per week
D) less than 28

Question

Quizplus · Accepted Answer

The interval for approximately 95% of the data in a symmetric, mound-shaped distribution (normal distribution) is given by the mean ± 2 standard deviations. Here, it is 18 ± 2(5), which is between 8 and 28 hours per week.

The Amount of Television Viewed by Today's Youth Is of Primary