Which is TRUE about randomized experiments?
I.Randomization reduces the effects of confounding variables.
II.Random assignment of treatments allows results to be generalized to the larger population.
III.Blocking can be used to reduce the within-treatment variability.
A)I only
B)II only
C)III only
D)I and III
E)I, II, and III

Question

Quizplus · Accepted Answer

I. Randomization indeed reduces the effects of confounding variables by ensuring that each participant has an equal chance of being assigned to any group, thus balancing out unknown factors across groups. III. Blocking is a technique used to organize experimental units into blocks that are similar to one another, which can indeed reduce the within-treatment variability by controlling for known sources of variability among experimental units. However, II is incorrect because random assignment of treatments allows for the internal validity of the experiment but does not necessarily allow results to be generalized to the larger population; generalizability depends on how representative the sample is of the population, not on the random assignment of treatments.

Which Is TRUE About Randomized Experiments