The following hypothesis was investigated in a study: daily "doses of humor" will cause arthritis sufferers to use less pain medication and exercise longer. Which of the following is the independent variable?
a. Amount of pain medication
b. Arthritis sufferers
c. Doses of humor
d. Length of exercise
ANS: C
"Doses of humor" is the independent variable in this study.
Amount of pain is a dependent variable in the study.
"Arthritis sufferer" is not a variable in the study.
Length of exercise is a dependent variable in the study.
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