You are considering testing a new drug that is supposed to facilitate learning in mentally retarded children. Because there is relatively little known about the drug, you plan to use a nondirectional alternative hypothesis. Since your resources are limited, you can test only 20 subjects. The subjects will be run in a repeated measures design and the data will be analyzed with the sign test, using a = 0.05 2 tail.

Refer to Exhibit 11-1. what is the power of this experiment?

0.4163

0.2969

0.6161

0.2458