Question: A researcher begins with a known population—in this case, scores on a standardized test that are normally distributed with . = 65 and o = 15. The researcher suspects that special training in reading skills will produce a change in the scores for the individuals in the population. Because it is not feasible to administer the treatment (the special training) to everyone in the population, a sample of n = 25 individuals is selected, and the treatment is given to this sample. Following treatment, the average score for this sample is M = 70. Is there evidence that the training has an effect on test scores?

1. State the hypotheses and set the alpha level.
2. Locate the critical region.
3. Obtain the sample data and compute the test statistic.
4. Make a decision about Ho and state the conclusion.
5. Compute Cohen’s d to determine the effect size.

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