Thirty-one small communities in Connecticut (population near10,000 each) gave an average of x = 138.5 reported casesof larceny per year. Assume that ĂŹĆ’ is known to be 43.7cases per year.
(a) Find a 90% confidence interval for the population meanannual number of reported larceny cases in such communities. Whatis the margin of error? (Round your answers to one decimalplace.)
| lower limit    | |
| upper limit    | |
| margin of error    | |
(b) Find a 95% confidence interval for the population mean annualnumber of reported larceny cases in such communities. What is themargin of error? (Round your answers to one decimal place.)
| lower limit    | |
| upper limit    | |
| margin of error    | |
(c) Find a 99% confidence interval for the population mean annualnumber of reported larceny cases in such communities. What is themargin of error? (Round your answers to one decimal place.)
| lower limit    | |
| upper limit    | |
| margin of error |
