Rather Than Personally Reading the Research Instructions to Each Subject

Multiple Choice

Rather than personally reading the research instructions to each subject, an investigator has the subjects listen to a tape recording of the research instructions. In this case, the researcher is trying to optimize t by

A) driving the means further apart.
B) decreasing the variability of response within groups.
C) using a paired t test rather than an independent t test.
D) increasing the total size of the study.