Thirty-one small communities in Connecticut (population near 10,000 each) gave an average of x = 138.5...

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Thirty-one small communities in Connecticut (population near10,000 each) gave an average of x = 138.5 reported casesof larceny per year. Assume that Ïƒ 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.)
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(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 limitÂ Â Â Â
upper limitÂ Â Â Â
margin of errorÂ Â Â Â

(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 limitÂ Â Â Â
upper limitÂ Â Â Â
margin of error

Answer & Explanation Solved by verified expert

4.3 Ratings (761 Votes)

Given thatGiven that 1385 437n 31a At 90 confidence level the z is 1 90 1 090 010 2 010 2 005Z2 Z005 1645Margin of error E Z2 1645 88 31 129Margin of error See Answer

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