Question
A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n = 64 third-grade children is
A researcher is investigating the effectiveness of a new study-skills training program for
elementary school children. A sample of n = 64 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 = 150 and a standard deviation of = 22. The
mean for the sample is M = 156.
a. Identify the independent and the dependent variables for this study.
b. Assuming a two-tailed test, state the null hypothesis in a sentence that includes
the independent variable and the dependent variable.
c. Using symbols, state the hypotheses (H0 and H1) for the two-tailed test.
d. Calculate the test statistic (z-score) for the sample.
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