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True mean and Confidence level

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A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with a standard deviation of $1,500. Find a 95% confidence interval for the true mean annual income of the nursing school alumni. Write a statement about the confidence level and the interval you find.

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(a) n = 120

x-bar = 58700

s = 1500

α = 0.05

z or t- score = 1.9801

SE = s/sqrt n ...

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