A researcher is exploring 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 standard deviation of σ = 25. Mean for the sample is M = 158.
a. Recognize independent and dependent variables for this study.
b. Suppose two-tailed test, state hypotheses (Ho and H1 ) for two-tailed test.
c. Using symbols, define hypotheses (Ho and H1) for two-tailed test.
d. Draw the suitable distribution, and locate critical regions for α = .05.
e. Compute test statistics (z score) for the sample.
f. What decision must be made about effect of program?