One can optimize and strengthen the power of a t test in all of ...

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One can optimize and strengthen the power of a t test in all of the following ways, EXCEPT
 
  a. by using stronger treatments to drive the means of the two groups farther apart.
  b. by decreasing the effect size of the study.
  c. by decreasing the variability within groups.
  d. by increasing the total size of the study.

Question 2

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.

[AISCAMPING]

Answer to Question 1

b

Answer to Question 2

b

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TYSM

[ebonylittles]

Excellent