In Problem 13.4 on page 531, the marketing manager used shelf space for pet food to predict weekly sales. Perform a residual analysis for these data (stored in Petfood). Evaluate whether the assumptions of regression have been seriously violated.
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