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.
E) avoid interviewee bias and sampling variation.

Question

Quizplus · Accepted Answer

A double-blind study is designed to prevent both the participants and the experimenters from knowing who is receiving a particular treatment, which helps to eliminate observer and interviewee bias.

The Purpose of a Double-Blind Study Is To