13.4 What’s wrong? In each of the following, identify what is wrong and then either explain why it is wrong or change the wording of the statement to make it true.

  1. (a) Parallel profiles of cell means imply that a strong interaction is present.

  2. (b) You can perform a two-way ANOVA only when the sample sizes are the same in all cells.

  3. (c) The estimate is obtained by pooling the marginal sample variances.

  4. (d) When interaction is present, the marginal means are always uninformative.