If your planned study has power below 80%, you should first consider:
A)increasing the size of the samples
B)raising the study's level of significance
C)using the true population variance
D)treating the two samples as one sample

Question

Quizplus · Accepted Answer

Increasing the size of the samples is the best option for increasing power. A larger sample size will decrease the standard error and increase the ability to detect a significant difference between the groups. Raising the study's level of significance is not recommended as it increases the chances of a type I error. Using the true population variance is not practical as it is rarely known in advance. Treating the two samples as one sample would not increase the power but would decrease the degrees of freedom and potentially increase the standard error.

If Your Planned Study Has Power Below 80%, You Should