# Question

Refer to the aphid data in Exercise 13.8. Obtain the residuals from the model you selected in Exercise 13.9.

a. Is there evidence in the residuals of a violation of the normality condition?

b. Is there evidence in the residual plots of a violation of the constant variance condition?

c. Perform a BP test for constant variance. Does the test agree with your observations in part (a)?

d. Determine the appropriate Box– Cox transformation for these data.

In exercise

a. Is there evidence in the residuals of a violation of the normality condition?

b. Is there evidence in the residual plots of a violation of the constant variance condition?

c. Perform a BP test for constant variance. Does the test agree with your observations in part (a)?

d. Determine the appropriate Box– Cox transformation for these data.

In exercise

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