7.24. For the 2006 GSS, a comparison of females and males on the number of hours a day that the subject watched TV gave:

Group N Mean StDev SE Mean Females 1117 2.99 2.34 0.070 Males 870 2.86 2.22 0.075

(a) Conduct all parts of a significance test to analyze whether the population means differ for females and males. Interpret the P-value, and report the conclusion for a-level =

0.05.

(b) If you were to construct a 95% confidence interval comparing the means, would it contain 0? Answer based on the result of (a), without finding the interval.

(c) Do you think that the distribution of TV watching is approximately normal? Why or why not? Does this affect the validity of your inferences?