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 15 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.
Assume N is increased from 15 to 20, what is the power this time?
1. 0.4163
2. 0.2458
3. 0.6161
4. 0.2969