A Set of Sample Scores from an Experiment Has an N

question 71

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, z crit = _________.

• A) +1.96
• B) - 1.96
• C) - 1.645
• D) +1.645