For each of the situations below, calculate both the \(r^{2}\) and Cohen's \(d\) measure of effect size and specify whether each is a "small," "medium," or "large" effect as outlined in the chapter.

a. \(d f=18, t=2.23\)

b. \(d f=30, t=1.90\)

c. \(d f=20, t=2.09\)

d. \(d f=80, t=2.09\)

e. \(d f=74, t=3.49\)