A Researcher Reports That the Mean Difference in the Body

Multiple Choice

A researcher reports that the mean difference in the body weight of rats following a pharmacological versus control treatment is 14 grams,with a pooled sample variance equal to 256.What is the effect size for this test using estimated Cohen's d?

A) d = 0.06;small effect size
B) d = 0.08;small effect size
C) d = 0.88;large effect size
D) There is not enough information to answer this question.