A researcher designs an experiment by manipulating the weight of an individual (normal, over); age (young, middle, old); and gender (male, female). How many interactions are possible?
A)2
B)3
C)4
D)18

Question

Quizplus · Accepted Answer

There are two types of interactions possible in this experiment: two-way interactions and three-way interactions. There are two two-way interactions: weight by age and weight by gender. There is one three-way interaction between weight, age, and gender. Therefore, there are a total of four possible interactions (2 two-way interactions plus 1 three-way interaction).

A Researcher Designs an Experiment by Manipulating the Weight of an Individual