Thirty small communities in Connecticut (population near 10,000 each) reported an average of = 138.5 cases
Question:
(a) Find a 90% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error?
(b) Find a 95% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error?
(c) Find a 99% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error?
(d) Compare the margins of error for parts (a)–(c). As the confidence levels increase, do the margins of error increase?
(e) Compare the lengths of the confidence intervals for parts (a)–(c). As the confidence levels increase, do the confidence intervals increase in length?
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Related Book For
Understanding Basic Statistics
ISBN: 9781111827021
6th Edition
Authors: Charles Henry Brase, Corrinne Pellillo Brase
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