Question: a. For Example 11.1 use the Scheff half-width to test the significance of the interaction contrasts that are suggested by Figure 11.1a. Contrast this with

a. For Example 11.1 use the Scheff half-width to test the significance of the interaction contrasts that are suggested by Figure 11.1a. Contrast this with the conclusions using the separate-r method.

b. Apply the expression for the most significant linear function from Chapter 18 to identify the primary source of significance in the test for interaction. You may prefer to use the first form in (11.16) to express the interaction hypothesis.

c. Develop the projection ellipse to study the source of significance.

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