Refer to the U.S. Army Corps of Engineers data on fish contaminated

Refer to the U.S. Army Corps of Engineers data on fish contaminated from the toxic discharges of a chemical plant located on the banks of the Tennessee River in Alabama. In Exercise 11.26 you fit the first-order model E(y) = βo + β1x1 + β2x2 + β3x3, where y = DDT level in captured fish, x1 = miles captured upstream, x2 = fish length, and x3 = fish weight. Conduct a complete residual analysis for the model. Do you recommend that any model modifications be made? Explain.


Data from Exercise 11.26

Refer to the U.S. Army Corps of Engineers data on fish contaminated from the toxic discharges of a chemical plant located on the banks of the Tennessee River in Alabama. Recall that the engineers measured the length (in centimeters), weight (in grams), and DDT level (in parts per million) for 144 captured fish. In addition, the number of miles upstream from the river was recorded. The data are saved in the DDT file.