In Problem 14.6 on page 583, you used radio advertising and newspaper advertising to predict sales (stored in Advertise). Use the results from that problem.
a. Determine whether there is a significant relationship between sales and the two independent variables (radio advertising and newspaper advertising) at the 0.05 level of significance.
b. Interpret the meaning of the p-value.
c. Compute the coefficient of multiple determination, r2, and interpret its meaning.
d. Compute the adjusted r2.