In which of the following experiments could we NOT use random assignment?
A) a comparison of groups receiving three different levels of a drug
B) a comparison of driving errors with and without consuming alcohol
C) the comparison of people from several religious groups in terms of acceptance of others' beliefs
D) None of the above could use random assignment.

Question

Quizplus · Accepted Answer

Random assignment involves assigning participants to different groups in a way that each participant has an equal chance of being in any group. This can only be done when the groups being compared are similar in terms of relevant characteristics. However, in the case of comparing people from different religious groups, there may be cultural or other differences that cannot be controlled for, making random assignment impossible.

In Which of the Following Experiments Could We NOT Use