A Set of Sample Scores from an Experiment Has an N

Multiple Choice

A set of sample scores from an experiment has an N = 28 and a mean = 52. H 1 is directional, predicting an effect of the independent variable which decreases the magnitude of the dependent variable. H 0 asserts the sample is a random sample from a population of scores where µ = 55 and s = 12. a = 0.05_{1 tail}. Using the z test to analyze the data, the power of the experiment to detect a real effect such that µ real = 53 is _________.

A) 0.3541
B) 0.7764
C) 0.7600
D) 0.2236