Cohen Has Proposed Some Effect-Size Conventions Based on the Effects

Multiple Choice

Cohen has proposed some effect-size conventions based on the effects observed in psychology research in general because:

A) researchers frequently need to decide whether the effect size that they have found allows them to reject the null hypothesis
B) it is usually difficult to know how big an effect to expect from a given experiment
C) Cohen originally developed the relevant scales
D) they are more accurate than figuring a minimum meaningful difference