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 Consider the formula for a Z statistic (Z = [(X - U)/S].  Let’s say that the mean age of people in a class of 31 students is 33.8 years, and the standard deviation is equal to 7 years, and that you as a member of the class are 26.  Substitute these values into the formula and tell me what Z is equal to?  What does this tell us?  

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    Dr NAPOLEON
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    prof Doris A++
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