Question: A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n = 25 third-grade children is selected to participate in the program and each child is given a standardized achievement test at the end of the year. For the regular population of third-grade children, scores on the test form a normal distribution with a mean of µ = 150 and a standard deviation of ơ = 25. The mean for the sample is M = 158.

1. Identify the independent and the dependent variables for this study.
2. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the independent variable and the dependent variable.
3. Using symbols, state the hypotheses ( H 0 and H 1) for the two-tailed test.
4. Sketch the appropriate distribution, and locate the critical region for α = .05.
5. Calculate the test statistic ( z -score) for the sample.
6. What decision should be made about the null hypothesis, and what decision should be made about the effect of the program?

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