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# In a normal distribution with a mean of 20 and the standard deviation of 5, what are chances of a result of 36? 9. In a two sided test with alpha, or...

**You want to have data from 50 nurses collected 3 times over the course of a year to measure the effectiveness or a new scheduling system on stress. Based on turnover statistics, you expect 10% of them to leave within 12 months. How many nurses should you include in your initial study group?**