In looking at the sampling plan of a study, the reviewer knows that the sample size needed for a study increases when the:

Question

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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.

In Looking at the Sampling Plan of a Study, the Reviewer