Of the following, which is not a critical part of designing a good experiment?
A) Random selection of subjects.
B) Random assignment of subjects to treatments.
C) All of these are important.
D) Replication of a sufficient number of subjects.
E) Control of known sources of variability.

Question

Quizplus · Accepted Answer

Random selection of subjects is not always necessary for a good experiment, especially if the goal is to establish causality rather than generalize to a larger population. Random assignment, replication, and control of variability are more critical for internal validity.

Of the Following, Which Is Not a Critical Part of Designing