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Question(s) / Instruction(s):

1. A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 200 of its alumni. The mean annual income was $52,500 with a standard deviation of $1,800. 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. 2. An auditor wants to estimate what proportion of a bank‚s commercial loan files is incomplete. The auditor randomly samples 100 files and finds 9 are incomplete. Using a 95% confidence interval, estimate the true proportion of incomplete files for ALL the bank‚s commercial loans. Write a statement about the confidence level and the interval you find.

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