Question 514965: A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person. The following table gives the monthly distances in miles driven by a random sample of 16 sales persons:
2011, 1969, 2396, 2365, 2014, 2184, 2234, 2141, 2419, 2041, 1922, 2616. 2377, 1942, 2227, 2519
Based on this sample, find a 90% confidence interval for the mean number of miles driven monthly by members of the sales staff, assuming that monthly driving distances are normally distributed. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
What is the lower limit of the confidence interval?
What is the upper limit of the confidence interval?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The following table gives the monthly distances in miles driven by a random sample of 16 sales persons:
2011, 1969, 2396, 2365, 2014, 2184, 2234, 2141, 2419, 2041, 1922, 2616. 2377, 1942, 2227, 2519
Based on this sample, find a 90% confidence interval for the mean number of miles driven monthly by members of the sales staff, assuming that monthly driving distances are normally distributed. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
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Sample mean : 2211.0625
ME = 1.645*218.513/sqrt(16) = 89.8635
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What is the lower limit of the confidence interval? sample mean-ME
What is the upper limit of the confidence interval? sample mean+ME
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Cheers,
Stan H.
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