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Posted: **Mon Nov 15, 2021 9:58 am**

: 5 W W 5 A Bank Manager Wants To Know The Mean Amount Of Mortgage Paid Per Month By Homeowners In An Area A Random Samp 1 (26.78 KiB) Viewed 127 times

: 5 W W 5 A Bank Manager Wants To Know The Mean Amount Of Mortgage Paid Per Month By Homeowners In An Area A Random Samp 2 (26.32 KiB) Viewed 127 times

5 w W 5- A bank manager wants to know the mean amount of mortgage paid per month by homeowners in an area. A random sample of 120 homeowners selected from this area showed that they pay an average of $1575 per month for their mortgages. The population standard deviation of all such mortgages is $215. a. Find a 97% confidence interval for the mean amount of mortgage paid per month by all homeowners in this area. VE

4- The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 3000 Seniors who pay for the medicines showed that they spent an average of $5300 last year on medicines with a standard deviation of $750. a- Make a 99% confidence interval for the corresponding population mean. b- What is margin of error? And what does the value of the margin of error depend?