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The purpose of a double-blind study is to: a

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The purpose of a double-blind study is to:

a. achieve comparability of cases and controls.

b. reduce the effects of sampling variation.

c. avoid observer and interviewee bias.

d. avoid observer bias and sampling variation.

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The correct answer is c. A researcher cannot be biased towards or against a particular result if he or she does not know which subjects received a particular treatment, adn which were in the control group. Likewise, study subjects cannot be biased if they do not know which treatments they received.