12.5. A recent GSS asked, “How often do you go to a bar or tavern?” Table 12.23 shows descriptive statistics and an ANOVA table for comparing the mean reported number of good friends at three levels of this variable.

(a) State the (i) hypotheses, (ii) test statistic value,

(iii) P-value, (iv) decision for an α = 0.05-level test.

(b) Does any aspect of the summary here suggest that an assumption for the F test may be badly violated? Explain.

(c) Set up dummy variables, and show the prediction equation you would obtain, based on the results shown in the table.