Analyze the underlying assumptions for the model. No need to prepare residual plots, just discuss them. Comment on the validity of the statistical analysis in part (a).

This Homework Assignment includes Problem 5.25, and Problem 5.31 parts (a) and (b).
For problem 5.25, use an overall significance level of .05 for the tests of hypotheses. Note that the ln function in SAS is LOG.
For problem 5.31 (a) use an overall significance level of .10 for all 7 tests, and analyze the experiment as if all the underlying assumptions are valid.
For 5.31 (b) Analyze the underlying assumptions for the model. No need to prepare residual plots, just discuss them. Comment on the validity of the statistical analysis in part (a).