Refer to Exercise 15.1. The study was conducted and the yields in pounds of blueberries over a growing season are given in the following table.
a. Use residual plots to determine if there appear to be a violations in the conditions of normality and equal variance of the residuals.
b. What is the standard error in estimating the mean yield for each of the five methods of irrigation?
c. What is the standard error in estimating the difference in the mean yields of two of the methods of irrigation?
d. Is there significant evidence at the α = .05 level that the five methods of irrigation ­differ in their mean yields?
e. Use a multiple- comparison procedure to determine which pairs of the five meth­ods of ­irrigation have different means.

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