Groups are defined by assigning different levels of the factor.

Name: Groups are defined by assigning different levels of the factor.
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Groups can be defined by assigning different levels of the factor. For example, in a study on the effects of caffeine on attention, researchers might assign participants to two groups: a caffeine group and a placebo group. The factor (caffeine) has been assigned at two different levels (presence or absence) to create the two groups.

Groups Are Defined by Assigning Different Levels of the Factor