How many main effects are possible in a study with a 2 × 3 × 2 factorial design?

A) 18
B) 7
C) 4
D) 3

Main Effects

A statistical term referring to the individual impact of each independent variable on the dependent variable in an experiment, distinguishing from interactions between variables.

Factorial Design

Factorial design is a statistical test used in experiments where there are two or more independent variables and it evaluates the effect of each, as well as the interaction between them, on the dependent variable.