Question

interval for the average time (hours per month) spent watching videos on oell phones among U.S. college students. We From this sample, we have the following. (Round your answers to two decimal places) x-715 ノ 稼ulpvely less than 1.5 standard deviations away from the null hypotheszed value μ- 54 Because the degrees of freedom aren-1

Answer 1

Because the degrees of freedom are n - 1 = 7, this t statistic has the t(7) distribution.

The figure below shows that the P-value is 2P(T >= 1.39), where T has the t(7) distribution.

From Table D, we see that P(T >= 1.119) = 0.15 and P(T >= 1.415) = 0.10.

Therefore, we conclude that the P-value is between 2 x 0.10 = 0.20 and 2 x 0.15 = 0.30.

These data are compatible with a mean of 5.4 hours per month.

There is not enough evidence to reject the null hypothesis at the 0.05 level.