The sample size needed for a study increases when:
A) the alpha level is increased from .01 to .05.
B) the number of variables in the study increases.
C) a one-tailed versus a two-tailed statistical test is used.
D) the sensitivity of the instruments used is high.

Question

Quizplus · Accepted Answer

As the number of variables under study increases, the sample size needed may increase.
The reverse of this statement is True. As the number of variables under study increases, the sample size needed may increase.
One-tailed tests do not require as large a sample as two-tailed tests. As the number of variables under study increases, the sample size needed may increase.
High sensitivity of the instruments can allow for a smaller sample size. As the number of variables under study increases, the sample size needed may increase.

The Sample Size Needed for a Study Increases When