The purpose of a double-blind study is to: avoid observer and subject bias avoid observer bias and sampling variation avoid subject bias and sampling variation achieve comparability of treated and untreated subjects

Avoid observer and subject bias

Explanation:

Double-blind study is a human clinical trial method where neither the examiner nor the examiner knows what is being used as a variable at any given time. The purpose of the double-blind test is to avoid any conscious or unintentional interference with the results of an experiment and thus to avoid observer or subject bias in the result of the experiment.

answer; i believe the answer is (b) fascism;

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