Use the summary of Levenes test for nonconstant variance given in Figure 12.10 resulting from a single-factor analysis of variance with four treatments to check the constant variance assumption. Is it reasonable to assume that each of the treatment groups has the same variance? Explain.

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TRT 4 3 2 1 Test for Equal Variances Multiple comparison intervals for the standard deviation, = 0.05 Multiple Comparisons P-Value 0.140 Levene's Test 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 If intervals do not overlap, the corresponding stdevs are significantly different. P-Value 0.429