Sea bream are one type of fish that are often raised in large fish farming enterprises. These fish are usually fed a diet consisting primarily of fish meal. The authors of the paper €œGrowth and Economic Profit of Gilthead Sea Bream (Sparus aurata, L.) Fed Sunflower Meal€ (Aquaculture [2007]: 528€“534) describe a study to investigate whether it would be more profitable to substitute plant protein in the form of sunflower meal for some of the fish meal in the sea bream€™s diet. The accompanying data are consistent with summary quantities given in the paper for x = percentage of sunflower meal in the diet and y 5 average weight of fish after 248 days (in grams).

The estimated regression line for these data is y^ = 448.536 2 0.696x and the standardized residuals are as given.

Construct a standardized residual plot. What does the plot suggest about the adequacy of the simple linear regression model?

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Sunflower Meal (%) Average Fish weight 12 18 24 30 36 432 450 455 445 427 422 421 Sunflower Meal (%), x Standardized Residual 6 12 18 24 30 36 0.58 1.42 0.84 -0.46 -0.58 0.29