A researcher is interested in variables that may affect an individual's driving ability. He has people drive a course in wet, dry, or icy conditions. In addition, he has them drive a vehicle with or without power steering, and with an automatic or a manual transmission. In this design, there are _____ possible main effects and _____ possible interactions.
A)2; 2
B)3; 4
C)3; 12
D)2; 3

Question

Quizplus · Accepted Answer

There are three main effects: road condition, power steering, and transmission type. There are four possible interactions: road condition and power steering, road condition and transmission type, power steering and transmission type, and the three-way interaction among all three variables.

A Researcher Is Interested in Variables That May Affect an Individual's