When analysis of data reveals a difference between levels of a factor, this is called the:
A) Interaction effect
B) Factor effect
C) Level effect
D) Main effect

Question

Quizplus · Accepted Answer

When there is a difference between levels of a factor, this is called the main effect. The main effect refers to the effect of a single independent variable on the dependent variable, irrespective of the other independent variables. A main effect can be thought of as the overall impact of a factor on the outcome variable. The other options are not correct definitions of this concept.

When Analysis of Data Reveals a Difference Between Levels of a Factor