A researcher wants to know if a treatment significantly changes the wellbeing of someone with depression. The average person with depression scores a 7.2 on a wellbeing scale with a SD of 1.4 points. The researcher administers the treatment to 25 clients for a month and finds their wellbeing at the end to be 7.7. Assume an alpha level of .05.  What are the null and alternative hypotheses?  What Z-score(s) corresponds to the alpha level? In other words, at what point(s) would we reject the null hypothesis?  What is the effect size of the treatment using Cohen’s d?

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