18. For each of the following studies, the samples were given an experimental treatment and the researchers

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18. For each of the following studies, the samples were given an experimental treatment and the researchers compared their results to the general population. For each, carry out a Z test using the five steps of hypothesis testing for a twotailed test at the .01 level, and make a drawing of the distributions involved.

ADVANCED TOPIC: Figure the 99% confidence interval for each study.

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