The fixed-effects and random-effects frameworks for meta-analysis differ with respect to
A) assumptions made about the sources of variability between studies.
B) the type of studies-experiments or surveys-that are analyzed.
C) the appropriateness of conducting tests of statistical significance.
D) the presence or absence of random processes such as random sampling and random assignment in the studies that are being analyzed.

Question

Quizplus · Accepted Answer

The fixed-effects model assumes that all studies estimate the same underlying effect size, with variability due only to within-study error. The random-effects model assumes that the effect sizes vary between studies due to both within-study error and between-study variability.

The Fixed-Effects and Random-Effects Frameworks for Meta-Analysis Differ with Respect