A Cognitive Psychologist Wants to Do an Experiment to Test

Multiple Choice

A cognitive psychologist wants to do an experiment to test a variable that may influence the memory of elderly people.She has the following constraints: only 12 people are available as possible participants,and the independent variable she plans to manipulate requires the use of a separate group for each of the two conditions.The psychologist has a reliable and valid pretest she can use to evaluate participants' memory prior to the manipulation.Which design is this psychologist likely to use?

A) random groups design
B) natural groups design
C) matched groups design
D) placebo control design