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A recent meta-analysis of seven studies concluded that dietary intakes (not vitamin supplements) of vitamin E, C, and beta-carotene were linked to a reduced risk of ________ disease.
Random Sample
A method of selecting a subset of individuals from a population in which each person has an equal chance of being chosen.
Double-Blind Experiment
An experimental design in which neither the participants nor the experimenters know who is receiving a particular treatment, to prevent bias.
Case Study
A detailed analysis of a person, group, event, or situation over a period of time, used as a research method in psychology and other disciplines.
Correlation
A statistical measure that indicates the extent to which two or more variables fluctuate together.
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