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 appropriate conclusion?
A)Reject null hypothesis
B)Do not reject null hypothesis
C)It cannot be determined without also knowing the population mean
D)It cannot be determined without also knowing the population SD or its estimate

Question

Quizplus · Accepted Answer

The calculated t-value is (5.2 - 0) / 2.0 = 2.6, which is greater than the cutoff t of 1.833. However, since the prediction was a decrease and the result was an increase, the null hypothesis is not rejected.

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