22, A researcher is interested in assessing the combined effect of a cup of morn

Question

22, A researcher is interested in assessing the combined effect of a cup of morning coffee (yes or no) and a good night's sleep (yes or no) on degree of agitation. The researcher discovers that there is an additive effect of the two variables. This indicates that: a. There was no interaction effect and neither variable affected agitation alone (in other words, there were no main effects either). b. There was a main effect of coffee, but no main effect of sleep. There was an interaction effect, such that people who drink coffee and did not

Explanation / Answer

The answer would be Option 3, which indicates the presence of an interaction effect between the coffee and the good night’s sleep combined. These two factors would combined to produce an additive effect on the dependent variable.

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