In a random-effects model, the summary effect size will be _____(a)_____ influenced by one extremely large sample; in a fixed-effects model, the summary effect size will be _____(b)_____ influenced by one extremely large effect size.
A) greatly; slightly
B) greatly; not at all
C) not at all; slightly
D) slightly; greatly

Question

Quizplus · Accepted Answer

In a random-effects model, the summary effect size is only slightly influenced by one extremely large sample because the weight of each study is based on both within-study variance and between-study variance. In contrast, in a fixed-effects model, the summary effect size is greatly influenced by one extremely large effect size because each study is given equal weight, regardless of its size or quality.

In a Random-Effects Model, the Summary Effect Size Will Be