Table 7.14 summarizes the number of hours spent in housework per week by gender, based on the 2002 GSS (variable RHHWORK).

(a) Estimate the difference between the popula- tion means for women and men.

(b) Show that the estimated standard error of the sample difference is 0.81. Interpret.

(c) Show that a 99% confidence interval for the difference is (2.3, 6.5). Interpret.