The estimated regression equation
where
y = number of indictments disposed of in a given month
x 1 = number of cases on judge’s docket
x 2 = number of cases pending in the criminal trial court
x 3 = x1x2
appeared in the article “The Caseload Controversy and the Study of Criminal Courts” (Journal of Criminal Law and Criminology [1979]: 89– 101). This equation
was based on n = 367 observations. The bi’s and their associated standard deviations are given in the accompanying table.
Is inclusion of the interaction predictor important? Test H0: β3 = 0 using a .05 level of significance.
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