Mathematics, 09.12.2019 21:31 mirmir62
Costs are rising for all kinds of medical care. the mean monthly rent at assisted-living facilities was reported to have increased 17% over the last five years to $3486 (the wall street journal, october 27, 2012). assume this cost estimate is based on a sample of 120 facilities and, from past studies, it can be assumed that the population standard deviation is σ = $650 . a) develop a 90% confidence interval estimate of the population mean monthly rent.
b) develop a 95% confidence interval estimate of the population mean monthly rent.
c) develop a 99% confidence interval estimate of the population mean monthly rent.
d) what happens to the width of the confidence interval as the confidence level is increased? does this seem reasonable? explain.
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Costs are rising for all kinds of medical care. the mean monthly rent at assisted-living facilities...
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