Random selection of subjects for surveys is used to avoid:
A) placebo effects.
B) variability.
C) double-blindness.
D) bias.

Question

Quizplus · Accepted Answer

Random selection of subjects helps to avoid bias in the selection process, ensuring that everyone has an equal chance of being included in the survey. This reduces the risk of systematic errors or distortions in the data collected, which could otherwise compromise the validity and reliability of the results. Placebo effects, variability, and double-blindness are not directly related to random selection of subjects, although they may be relevant in other contexts.

Random Selection of Subjects for Surveys Is Used to Avoid