Why would you want to add levels to a single independent variable?
A) Control for no treatment effects
B) Determine more precisely the relationship between IV and DV
C) Increase subject randomization
D) a and b
E) b and c

Question

Quizplus · Accepted Answer

Adding levels to a single independent variable allows researchers to determine more precisely the relationship between the IV and DV (choice B) and control for no treatment effects (choice A).

Why Would You Want to Add Levels to a Single