The null hypothesis for a test of the relative contribution of two predictor variables is that the variance in X will be significantly different from the variance in Y.

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The null hypothesis for a test of the relative contribution of two predictor variables is typically that one or both of the predictor variables will not have a significant effect on the outcome variable. It does not pertain specifically to the variances of the predictor variables.

The Null Hypothesis for a Test of the Relative Contribution