A study cannot be an experiment if
A)only a subset of an existing population is measured.
B)a well-defined procedure of random sampling is not constructed.
C)a bias in measures is discovered.
D)a confounding variable is identified.
E)a procedure of random assignment to treatments is not performed.

Question

Quizplus · Accepted Answer

A key component of an experiment is random assignment of subjects to different treatments groups. If this is not performed, then the study cannot be classified as an experiment. The other options may affect the validity or reliability of the study, but they do not necessarily preclude it from being an experiment.

A Study Cannot Be an Experiment If