Does a stress reduction program help reduce stress in high school students at Alphabet High?  The population of interest is all students at Alphabet High.  The mean stress level for all students at the high school is 50 with a standard deviation of 7.  A sample of 20 students participated in a stress reduction program, after which the sample’s mean stress level was 45.  Conduct hypothesis testing (one-tailed) with alpha = .03 What is the appropriate critical z value for this problem?  Calculate the observed z (test statistic)  What is the effect size for the stress reduction program? (give the specific value)

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