Chapter 9, Problem 106H

Previously, an organization reported that teenagers spent 3.5 hours per week, on average, on the phone. The organization thinks that, cunenth; the mean is higher. Fifteen randomly chosen teenagers were asked how man how’s per week they spend on the phone. The sample mean was .1.75 hours with a sampLe standard deviation of 2.0. Conduct a hypothesis test.

At a significance level of a 0.05. what Is the coned conclusion?

a. There Is enough evidence to conclude that the mean number of hours is more than .175

b. There Is enough evidence to conclude that the mean number of hours is more than 4.5

c. There Is no enough evidence to conclude that the mean number of hours Is more than 4.5

d. There Is no enough evidence to conclude that the mean number of hours Is more than 4.75

Instructions: For the following ten exercises.

Hypothesis testing: For the following ten exercises, answer each question.

a. State the null and alternate hypothesis.

b. State the p-value.

C. State alpha.

d. What Is your decision?

e. Write a conclusion.

f. Answer any other questions asked in the problem.