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

Question 38

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

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