In order to ascertain the main effect of an independent variable, a researcher must use a(n) _____ design.

A) interaction
B) multiple correlation
C) factorial
D) independent groups

Independent Variable

A factor manipulated by the experimenter to investigate its effects on the dependent variable in a study.

Factorial Design

A design in which all levels of each independent variable are combined with all levels of the other independent variables. A factorial design allows investigation of the separate main effects and interactions of two or more independent variables.

Main Effect

The direct effect of an independent variable on a dependent variable.