10.83 Time spent on Internet In 2014, the General Social Survey asked about the number of hours a week spent on the World Wide Web (variable denoted WWWHR).

Some results are as follows:

a. Identify the response variable and explanatory variable.
Indicate whether each variable is quantitative or categorical.

b. Report and interpret the 95% confidence interval shown for the difference between the population means for males and females.

c. Report and interpret the steps of the significance test comparing the two population means. Make a decision, using significance level 0.05.

d. Try to replicate the results by downloading the wwwhours data set from the book’s website and using it with your favorite software.

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Group N Mean StDev SE Mean Male 621 12.1 16.6 0.027 Female 778 11.2 13.7 0.018 Difference mu(Male) mu (Female) Estimate for difference: 1.3 95% CI for difference: (-0.8, 2.5) T-Test of difference = 0 (vs): T-value = 1.03 P-value = 0.3044