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

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Quizplus · Accepted Answer

Since H1 is directional, we are conducting a one-tailed test. We calculate the z-score using the formula: z = (M - µ) / (s / √N) = (52 - 55) / (12 / √28) = -1.23. To find the critical value, we look up the z-score associated with the 5% alpha level in a z-table: -1.645. Therefore, z crit = -1.645.

A Set of Sample Scores from an Experiment Has an N