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Does Donating Blood Lower Cholesterol Levels? 50 Volunteers Have a Cholesterol

Question 333

Multiple Choice

Does donating blood lower cholesterol levels? 50 volunteers have a cholesterol test, then donate
Blood, and then have another cholesterol test. Which aspect of experimental design is present?


A) none of these
B) randomization
C) blinding
D) a placebo
E) a control group

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