A Set of Sample Scores from an Experiment Has an N

question 33

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, what is the correct conclusion regarding H 0 ?

• A) reject H 0 ; the independent variable has a real effect
• B) retain H 0 ; we cannot conclude that the independent variable has a real effect
• C) accept H 0 ; the independent variable has no effect
• D) reject H 0 ; the independent variable has no effect

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