For the data in Exercise 10, verify that if t2way is used to compare 20% trimmed means, the p-values for Factors A and B are 0.145 and 0.93. Why does the p-value for Factor A drop from 0.372 when comparing means to 0.145 with 20% trimmed means instead?
The file CRCch10 Ex10.txt, stored on the authorâ€™s web page, contains data, the first few lines of which look like this:
The first two columns indicate the levels of two factors and the dependent variable is in column 3. Use the function t2way to test the hypotheses of no main effects or interactions based on means. Verify that the p-values for Factors A and B are 0.372 and 0.952, respectively.