A pharmaceutical company wishes to study a possible new headache medicine. They are doing human trials with 1,000 volunteers who experience frequent headaches. The researchers will need to ________
A) control for the type of headache—stress, migraine, or other causes
B) have 10 volunteers in the control group
C) put all women in the control group and all men in the experimental group
D) give all 1,000 volunteers the same amount of the new medication
A
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