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AP® Psychology

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Random Assignment to Reduce Bias

APPSY-2B2DJE

Dr. Wilson has recruited 36 students from his psychology course to participate in his study on the effects of caffeine on perception. He wants to reduce bias by randomly assigning students to either the control or experimental group.

Which of the following approaches would be best?

A

Have students count off and assign odd numbers to the control group.

B

Draw names and assign the first 18 to the control group.

C

Arrange the volunteers alphabetically by last name and assign the first half of the alphabet to the control group.

D

Ask for volunteers and assign the first 18 to the control group.

E

Have every volunteer flip a coin and assign heads to the control group.