Consider the following analysis of variance for a model II experiment. Test for significant variance components among all main effects and interaction effects at the 0.01 level of significance(a) By using a pooled estimate of error when appropriate;(b) By not pooling sums of squares of insignificanteffects.

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Source of Degrees of Variation Mean Freedom Square 140 480 325 15 24 18 AB AC BC ABC Error Total -236264S