A recent GSS asked, “Would you say that you are very happy, pretty happy, or not too happy?” and “About how many good friends do you have?” Table 12.26 summarizes results, with number of friends as the response variable.

(a) State a research question you could answer with these data.

(b) Interpret the result of the F test, but indicate one assumption of the test that is clearly violated.

(c) Software reports Tukey 95% confidence intervals of (0.3, 5.7) comparing very happy and pretty happy, (−2.3, 6.5) comparing very happy and not too happy, and (−5.1, 3.3) comparing pretty happy and not too happy.
Interpret.