Calculate Cohen's d for t = 2.35 with N = 30 for each of the two groups.
A) .08
B) .31
C) .62
D) .89

Question

Quizplus · Accepted Answer

To calculate Cohen's d, we need to use the formula: d = t/sqrt(N), where t is the t-value and N is the sample size. 
Plugging in the values given, we get: 
d = 2.35/sqrt(30) = 0.429 
This corresponds to a medium effect size according to Cohen's guidelines. The closest answer choice is C, which has a value of 0.62, which is slightly larger than the calculated value, but still falls within the range of a medium effect size. The other answer choices are too small or too large to be considered an accurate estimate of Cohen's d using the given values.

Calculate Cohen's D for T = 2