Author Question: A difference between the performance of an experimental and a control group may be caused by: a. ... (Read 53 times)

lracut11 · **on:** Jun 20, 2018

A difference between the performance of an experimental and a control group may be caused by:

a. the independent variable.
b. the dependent variable.
c. a confounding variable.
d. either the independent or a confounding variable.

Question 2

In an experiment to study the effects of caffeine on performance, an experimenter asked the male students in an introductory psychology class to drink two regular Pepsis before a test and the female students to drink two caffeine-free Pepsis. She then compared performance of the two groups on the test. A confounding variable in this study is:

a. whether participants had studied for the test.
b. the type of drink.
c. the gender of the participants.
d. the amount of caffeine in the Pepsi.