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At Folger University, Drs. Chase and Sanborn are conducting an experiment on the effects of caffeine on memory. Participants are randomly assigned to a caffeine or a no-caffeine group; their recall of items on a word list is later assessed. Which pair correctly identifies a variable in this experiment?

A)caffeine – dependent variable
B)word recall – experimental variable
C)caffeine – independent variable
D)word recall – independent variable

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Answer:

C)caffeine is the independent variable

Explanation:

Caffeine is the independent variable and word recall is the dependent variable. Word recall is dependent on the presence or absence of caffeine.

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