3. an auditor wants to estimate what proportion of a bank?s commercial loan files are incomplete. the auditor randomly samples 60 files and finds 12 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. brbr2.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. brbr1.interpret a 90% confidence interval of (4.355, 4.445) for a population mean.
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