Need statistics help with Chapter 8, The average length of a prison term

Dec 1st, 2015
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the average length of prison term in the united states for white collar crimes is 34.9 months. A random sample of 40 Prison terms indicated a mean stay of 28.5 months with a standard deviation of 8.9 months. At a=0.04, is there sufficient evidence to conclude that the average stay differs from 34.9 moths?

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