One of the fundamental requirements of all true experiments is that the different groups be
A) equivalent at the outset.
B) tested under at least three different conditions.
C) matched on several covariates.
D) none of these, since in the true experiment different groups can never be

Question

Quizplus · Accepted Answer

Equivalence at the outset is essential for ensuring that any observed effects of the treatment can be attributed to the treatment itself rather than to pre-existing differences between groups. Matching on covariates can further enhance the comparability of groups, but it is not a requirement for all true experiments. Testing under different conditions is not necessarily a requirement for a true experiment, as long as there is a clear manipulation of an independent variable and an appropriate control group. The last option, "none of these," is incorrect, because equivalence between groups is indeed a necessary condition for a true experiment.

One of the Fundamental Requirements of All True Experiments Is