What is the effect of recruiting volunteers to participate in a randomized experiment?
A)The results will be more credible because people who really wanted to participate took part in the study.
B)The results cannot necessarily be extended to the larger population.
C)There will be no effect because the people are always randomly assigned to treatments, eliminating any type of bias.
D)Researchers are never allowed to use volunteers to participate in an experiment.

Question

Quizplus · Accepted Answer

Recruiting volunteers to participate in a randomized experiment may introduce volunteer bias, where the characteristics of the participants who volunteer may differ from those who do not, leading to results that may not be generalizable to the larger population.

What Is the Effect of Recruiting Volunteers to Participate in a Randomized