Chapter 9.1, Problem 2E

To determine

The population of teens that never argue with their friends.

Answer to Problem 2E

For null hypothesis $H_0$ total population of teen is 0.72, for alternative hypothesis $H_a$ population is not equal to 0.72 who never argue with their friends.

Explanation of Solution

Given Information:

Population from the survey report= 72%

By the null hypothesis,population value is equal to the 72%.

Convert 72% into decimal.

  $\frac{72}{100}=0.72$

Thus, $H_0:p=0.72$ .

By the alternative hypothesis mean population value can be greater or less than 72% but not exactly equal.

Thus, $H_a:p\ne 0.72$ .

Hence, for null hypothesis $H_0$ total population of teen is 0.72, for alternative hypothesis $H_a$ population is not equal to 0.72 who never argue with their friends.