When a statistically significant main effect has only two levels,the nature of the relationship is determined in the same fashion as for the independent groups t test;if a statistically significant main effect has three or more levels,then the nature of the relationship is determined using an HSD procedure.

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This statement is true. When there is a statistically significant main effect with only two levels, the relationship is determined similarly to the independent groups t-test. However, when there are three or more levels, an HSD procedure is used to determine the nature of the relationship.

When a Statistically Significant Main Effect Has Only Two Levels,the