Approximately how many research participants would be required for 80% power for a study using the t test for dependent means (assume a one-tailed hypothesis with an expected medium effect size of .50):
A)12
B)26
C)33
D)196

Question

Quizplus · Accepted Answer

For a study using the t-test for dependent means with an 80% power and a medium effect size (Cohen's d = .50), approximately 26 participants would be required. This is based on power analysis calculations for detecting a medium effect size with sufficient power.

Approximately How Many Research Participants Would Be Required for 80