Your assignment is to design a study to test the effectiveness of caffeine on performing rapid, precise movements. You want an A, so your design will _____
A)be a quasi experiment.
B)assign students alphabetically.
C)be a double blind study.
D)give all participants caffeine.

Question

Quizplus · Accepted Answer

A double blind study controls for experimenter bias. If you assign students alphabetically, you create selection bias; if you give them all caffeine, you have no control group. There is no need to do a quasi experiment, which is not able to show causality.

Your Assignment Is to Design a Study to Test the Effectiveness