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ID: 3309483 • Letter: D
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d, Secure https://l earn.cnm.edu/webapps/assessment/take/launch.jsp'eburse assesien Remaining Time: 40 minutes, 40 seconds. Question Completion Status B. 385 C. 38416 D. 3842 QUESTION 4 4 points Save Answer (b) Based on the number of records sampled in (a) and assuming that the population standard deviation is $1000 and the mean from the sample to be $1475. W hat is the 95% estimate for the mean property tax bill for home owners in Madison Wisconsin? hint: find confidence interval A. ($1298.10, $15002) B. ($1375.10, $1574.90) C. ($859.71, $1140.3) D. ($1300.1, $1499.90) QUESTION 5 4 points Save Answer O Type here to search 2:19 PM 11/24/2017Explanation / Answer
a) here margin of errror E =100
for 95% CI ; critical z =1.96
therefore required sample size n=(z*std deviation/E)2 =385
option B is correct
b)
here std error of mean =std deviaiton/(n)1/2 =1000/(385)1/2 =50.965
therefore confidence interval =sample mean -/+ z*Std error =1475 -/+ 1.96*50.965 =1375.1 ; 1574.9
option B is correct
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