Refer to the previous exercise. (a) Report the F statistic for testing H0: 1 = 2 =

Refer to the previous exercise.

(a) Report the F statistic for testing H0: β1 = β2 = 0, report its df values and P-value, and interpret.

(b) Show how to construct the t statistic for testing H0:

β1 = 0, report its df and P-value for Ha: β1 = 0, and interpret.

(c) When we add x3 = percentage of single-parent families to the model, we get the results in Table 11.15.

Why do you think the effect of poverty rate is much lower after x3 is added to the model?