In Problem 12.5 on page 424, you used the summated rating to predict the cost of a

Question:

In Problem 12.5 on page 424, you used the summated rating to predict the cost of a restaurant meal (stored in Restaurants). For those data, SSR = 9,740.0629 and SST = 17,844.75.
a. Determine the coefficient of determination, r2, and interpret its meaning.
b. Determine the standard error of the estimate.
c. How useful do you think this regression model is for predicting the cost of a restaurant meal?