Which of the following is the research hypothesis of one-tailed dependent t-test expecting to see a significant decrease in the observed scores? A. mean(posttest) mean(pretest) D. mean(posttest) ≠...

Which of the following is the research hypothesis of one-tailed dependent t-test expecting to see a significant decrease in the observed scores?

A. mean(posttest) <>

B. mean(posttest) = mean(pretest)