Using designs with more than two levels of an independent variable allows researchers to:

a. compare more than two kinds of treatment in one study.
b. compare two or more kinds of treatment with a control group.
c. compare a placebo group to the control and experimental groups.
d. accomplish all of the above.

d

Psychology

You might also like to view...

Give a brief description of the process required for a pharmaceutical company to test a new drug on humans and later to market a new prescription drug

What will be an ideal response?

Psychology

How much has tuition increased from 1982 to 2007 even when taking into account inflation?

a. 200% b. 300% c. 400% d. 500%

Psychology