For the Following Question(s): a Researcher Conducts a T Test

Multiple Choice

For the following question(s) : A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff t needed is -1.833. The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2.
-What is the effect size?

A) 5) 2/-1.833 = -2.84; large
B) 2/5.2 = .38; approximately medium
C) 5) 2/2 = 2.60; large
D) It cannot be determined without also knowing the population standard deviation