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Unformatted text preview: 18560 18950 19200 20300 Choose one answer: <++++> A B C D E Number 12 from Fall Exam 1 At the license bureau, it appears that the length of time it takes to get served (waiting and then getting a driver's license) is normally distributed. A sample of 16 randomly selected customers were served in an average of 42 minutes and these times had a standard deviation of 9 minutes. 12. Construct a 90% confidence interval for the average service time of all customers at the license bureau. The width of this interval is: 8.2 8.6 9.0 9.4 Choose one answer: <++++> A B C D E...
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 Spring '08
 Thompson

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