True experiments must have ______.

Question

Quizplus · Accepted Answer

True experiments require that participants be randomly assigned to a treatment group or a control group, as this is the only way to ensure that any observed effects are due to the treatment and not some pre-existing difference between the groups. Thus, the correct answer is D, which specifies that there must be two randomly assigned groups (one treatment and one non-treatment). Choices A, B, and C are all incorrect, as they each describe a type of design that does not meet the criteria for a true experiment.

True Experiments Must Have ______