When it is not possible to have participants experience all levels of the indepe

Question

When it is not possible to have participants experience all levels of the independent variable, an alternative approach to a within-groups design can be used. This approach offers the same advantage in statistical power as the within-groups design by:

A. creating larger between-groups differences by using more extreme levels of the independent variable.

B. using a larger number of participants across conditions.

C. using participants in each group that are matched on variables of interest that we want to control across conditions.

D. assessing differences with planned comparisons rather than post hoc tests.

Explanation / Answer

Answer: D

That is, assessing differences with planned comparisons rather than post hoc tests.

Since the post hoc tests are used to comparison between the individual pairs of means

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