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

Question

Quizplus · Accepted Answer

The scenario describes a before-and-after study on the same group of volunteers without any mention of randomization, blinding, placebo, or a separate control group.

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