SOLUTION: Random sample of 120 customers’s spent an average of 9.2 hours on their professional job with a sample standard deviation of 5.1 hours. Calculate the specification hours with confi

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Question 173598: Random sample of 120 customers’s spent an average of 9.2 hours on their professional job with a sample standard deviation of 5.1 hours. Calculate the specification hours with confidence of 95%.
Answer by stanbon(48568) About Me  (Show Source):
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Random sample of 120 customers’s spent an average of 9.2 hours on their professional job with a sample standard deviation of 5.1 hours. Calculate the specification hours with confidence of 95%.
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x-bar = 9.2
E = 1.96[5.1/sqrt(120)] = 4.21
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95% CI: 9.2-4.21 < u < 9.2+4.21
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Cheers,
Stan H.