Testing the equality of group variances

An important first step in the analysis of variance is establishing the validity of assumptions. One assumption of ANOVA is that the variances of the groups are equivalent. This example illustrates how that test is performed.

A sales manager wishes to determine the optimal number of product training days needed for new employees. He has performance scores for three groups: employees with one, two, or three days of training. The data are in the file salesperformance.sav. See the topic Sample Files for more information.

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