Consider the following research title: Cooperation among nursery school children under two types of instruction. In this study the independent variable is
a. cooperation
b. types of instruction
c. nursery school children
d. not stated in the title
Question 2
Professor Smith studied the effect of giving either two, four, or eight pellets of reward to rats that ran a maze. He measured how fast they ran, and how many wrong turns they made. How many levels of the independent variable did he have?
a. one
b. two
c. three
d. can't tell