The strength of a pretest-posttest quasi-experimental design is influenced by:
A) Similarity of participant characteristics
B) Random sampling of the accessible population
C) Random assignment of treatments to intact groups
D) a and c

Question

Quizplus · Accepted Answer

The strength of a pretest-posttest quasi-experimental design is influenced by similarity of participant characteristics (a) and random assignment of treatments to intact groups (c). Both of these factors help to reduce confounding variables and increase the internal validity of the study by creating comparable groups and ensuring that any differences in the posttest scores are due to the treatment and not other factors. Random sampling of the accessible population is not as relevant to a quasi-experimental design, as the researcher is often unable to randomly select participants due to practical or ethical reasons (such as using an existing group or organization).

The Strength of a Pretest-Posttest Quasi-Experimental Design Is Influenced By