What is the correct formula for Cohen's d for a paired-samples t test?
A) (X - M)/N
B) (X - M)/(N - 1)
C) (M - $\mu $)/s
D) (M - $\mu $)/(s - 1)

Question

What is the correct formula for Cohen's d for a paired-samples t test?
A) (X - M)/N
B) (X - M)/(N - 1)
C) (M - $\mu  $)/s
D) (M - $\mu  $)/(s - 1)

Quizplus · Accepted Answer

The correct formula for Cohen's d for a paired-samples t test is (M - μ)/(s/sqrt(N)), where M is the mean difference between the paired samples, μ is the population mean difference (usually assumed to be 0), s is the standard deviation of the differences, and N is the number of pairs. Choice C is the closest option to this formula, although it has some errors in notation (e.g., F1F1F1S1 should be replaced with SS). None of the other choices are correct formulas for Cohen's d for a paired-samples t test.

What Is the Correct Formula for Cohen's D for a Paired-Samples