Refer to Exercise 5.14. Suppose the mayor's staff reviews the proposed survey and decides that in order
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In exercise 5.14 The housing department in a large city monitors the rent for rent- controlled apartments in the city. The mayor wants an estimate of the average rent. The housing department must deter-mine the number of apartments to include in a survey in order to be able to estimate the average rent to within $ 100 using a 95% confidence interval. From past surveys, the monthly charge for rent- controlled apartments ranged from $ 1,000 to $ 3,500.
a. If the level of confidence is increased to 99% with the average rent estimated within $ 50, how many apartments need to be included in the survey?
b. Suppose the budget for the survey will not support increasing the level of confidence to 99%. Provide an explanation to the mayor, who has never taken a statistics course, of the impact on the accuracy of the estimate of the average rent of not raising the level of confidence from 95% to 99%.
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Related Book For
An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker
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