Question

What is the effect size for a sample M = 10.0 (n = 25), with a normal population of µ = 15.0, and a standard deviation of σ = 5.00. Note that some of the information provided is not needed.

		Cohen's d = 0.1, a small effect size.
		Cohen's d = 0.5, a medium effect size.
		Cohen's d = 0.8, a large effect size.
		Cohen's d = 1.0, a large effect size.

Answer 1

as we know that Cohen;s d =|M- µ }/ σ

therefore for above data ; Cohen's d =|10-15|/5 =1

hence correct option is : Cohen's d = 1.0, a large effect size