Additional Practice for Exam 1

Additional Practice for Exam 1 - 18560 18950 19200 20300...

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QMB 3250 Spring 2007 Exam 1 Feb. 1, 2007 Page 1 of 5 NO. 14 and 15 Spring Exam 1 14.How many households in your sample did NOT have a second income? 46 50 52.5 56 Choose one answer: <-------+-------+-------+-------+-------> A B C D E 15. What was the average TOTAL household income in your sample? 85630 86080 87000 87500 Choose one answer: <-------+-------+-------+-------+-------> A B C D E 14 and 15 fall exam 1 14. What percentage of the households in your sample had a secondary income that was larger than zero? 52.0 53.0 55.5 58.0 Choose one answer: <-------+-------+-------+-------+-------> A B C D E 15. You were not asked for this, but it is easily derived from what you were asked about. What was the average secondary income of the households in your sample?
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Unformatted text preview: 18560 18950 19200 20300 Choose one answer: &lt;-------+-------+-------+-------+-------&gt; 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: &lt;-------+-------+-------+-------+-------&gt; A B C D E...
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