In Problem 13.4 on page 531, the marketing manager used shelf space for pet food to predict weekly sales (stored in Petfood). For those data, SSR = 20,535 and SST = 30,025.
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 sales?
In problem

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Store Shelf Space (X) (Feet Weekly Sales () (S) 10 10 10 15 15 15 20 20 20 160 220 140 190 240 260 230 270 280 260 290 310 10 12