A Research Example Donovan examined the effect of age, education, and socioeconomic status on frequency of condom use.How many significant effects/interactions were possible in his study?

Question

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Donovan's study involves three independent variables: age, education, and socioeconomic status. The possible significant effects include the main effects of each variable (3 main effects: age, education, socioeconomic status) and their interactions. The interactions can be between two variables (3 two-way interactions: age*education, age*socioeconomic status, education*socioeconomic status) and one three-way interaction (age*education*socioeconomic status). Adding these together, 3 main effects + 3 two-way interactions + 1 three-way interaction = 7 possible significant effects/interactions.

A Research Example Donovan Examined the Effect of Age, Education