Consider the data of Review Exercise 12.64. Suppose it is
Chapter 12, Problem 12.67(choose chapter or problem)
Consider the data of Review Exercise 12.64. Suppose it is of interest to add some interaction terms. Namely, consider the modelyi = 0 + 1x1i + 2x2i + 3x3i + 12x1ix2i + 13x1ix3i + 23x2ix3i + 123x1ix2ix3i +i.(a) Do we still have orthogonality? Comment. (b) With the tted model in part (a), can you nd prediction intervals and condence intervals on the mean response? Why or why not? (c) Consider a model with 123x1x2x3 removed. To determine if interactions (as a whole) are needed, testH0: 12 = 13 = 23 =0 .Give the P-value and conclusions.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer