Chapter 9, Problem 71H

Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization chinks that, cunenth the mean is higher. Fifteen randomly chosen teenagers were asked how many bows per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test. the Type I enor Is:

a. to conclude that the cunent mean hours per week Is higher than 4.5, when In fact. It Is higher

b. to conclude that the current mean bouts per week Is higher than 4.5, when in fact, it is the same

c. to conclude that the mean hours per week currently Is 4.5, when In fact. It Is higher

d. to conclude that the mean hours per week currently Is no higher than .1.5, when In fact, It Is not higher