Scores on test form normal distribution with mean of micro , Ask an Expert

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

a. Draw the suitable distribution, and locate critical regions for α = .05.
b. Compute test statistics (z score) for sample.
c. What decision must be made about effect of program?

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