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

question 39

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

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