A Cognitive Psychologist Wants to Do an Experiment Testing the Memory

A cognitive psychologist wants to do an experiment testing the memory of elderly people.She has the following constraints: only 12 people available as possible participants and the independent variable she is manipulating requires the use of separate groups for each condition.The psychologist has a reliable and valid pretest she plans to use.Which design is this psychologist likely to use?

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

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