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Let us further assume that there was good interrater reliability on these frequency counts of behaviors and that they're interval or ratio level of measure, normally distributed, and independent observations.

1. Enter the data in an SPSS worksheet-one column for each variable (group membership, A; dependent variable, Y; and covariate, Xc).

Run the one-way ANOVA to compare mean levels of Y across groups on A factor (without covariate) and also a one-way ANOVA to compare mean levels of Xc, the covariate, across groups on the A factor (to see if scores on the covariate differ across treatment groups).

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