If a Repeated-Measures Study Shows a Significant Difference Between Two

Multiple Choice

If a repeated-measures study shows a significant difference between two treatments with α = .01,then what can you conclude about measures of effect size?

A) The value of Cohen's d is large.
B) The percentage of variance explained (r²) is large.
C) Both Cohen's d and r² are large.
D) A significant effect does not necessarily mean that the effect size will be large.