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Sometimes, in a Study with Both a Main Effect (Or

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Essay

Sometimes, in a study with both a main effect (or two) and an interaction, the interaction is the only important finding. Explain, using the caffeine study to illustrate.


Definitions:

Alternative Hypothesis

In hypothesis testing, the hypothesis that contradicts the null hypothesis, indicating there is an effect or a difference.

Test Statistic

An outcome obtained from samples in a hypothesis experiment, crucial in deciding if the null hypothesis should be dismissed.

P-value

Assuming the correctness of the null hypothesis, it is the possibility of obtaining test results that are equally or more extreme than those observed.

Sample Standard Deviation

A measure of the amount of variation or dispersion of a set of values in a sample.

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