Question: A researcher is interested in evaluating the effectiveness of using Ritalin to improve test scores among children with ADHD. Assume that we know that, on average, children with untreated ADHD score μ = 65 on a standardized math test and the standard deviation is

σ = 18. The researcher draws a random sample of size n = 64 of children with ADHD and treats them for a year with Ritalin. At the end of the year, the average improvement among the sample of those receiving Ritalin is found to be M = 70. Does Ritalin significantly increase test performance? Conduct a two-tailed Z-test with alpha set at .05 to test the hypothesis that the treatment is effective.

Step 1: Specify the null hypothesis (#14) and the alternative hypothesis (#15).

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