Question: For a two-factor research study with two levels for factor A and four levels for factor B, how many participants are needed to obtain five

For a two-factor research study with two levels for factor A and four levels for factor B, how many participants are needed to obtain five scores in each treatment condition for each of the following situations?
a. Both factors are between-subjects.
b. Both factors are within-subjects.
c. Factor A is a between-subjects factor and factor B is a within-subjects factor.

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