Posted by **Diane** on Tuesday, March 27, 2012 at 1:52pm.

Mail security estimates that the average daily per-store theft is less than $250, but wants to determine accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that X =$260 and s=$20.

a) Test at a=.05

b) Construct a 95% CIE of u

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