Chapter 11.1, Problem 25PPS

(a)

To determine

To find: The sample and the population suggested in the given report.

Answer to Problem 25PPS

The sample and population are given below.

Explanation of Solution

The sample group is the citizens of U.S.who spends number of minutes on cell phone from the age of $8\text{to}18$ years old in U.S.

The population is all the citizens of the U.S. from the age of $8\text{to}18$ years old.

(b)

To determine

To find: The type of sample statistic.

Answer to Problem 25PPS

The type is given below.

Explanation of Solution

The average time $8\text{-18}$ years old talk and text on the phone.

(c)

To determine

To find: The result of the study for each age group.

Answer to Problem 25PPS

The result is shown below.

Explanation of Solution

Given:

  

Calculation:

The left bar represents talking and right bars represents texting.

  $8\text{-10}$ years old talked for approximately $10$ minutes a day, and did not text at all.

  $11\text{-14}$ years old talked for approximately $30$ minutes a day, and texted approximately $70$ a day.

  $15\text{-18}$ years old talked for approximately $40$ minutes a day, and texted approximately $110$ a day .

(d)

To determine

To find: The details aboutthe interest in this type of survey.

Answer to Problem 25PPS

A cell phone company.

Explanation of Solution

A cell phone company must be interested to know the usage of cell phone.