econ10 - Question #1 Suppose that the number of cigarettes...

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Question #1
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Suppose that the gallons of gas purchased at Garry's Gas Station is normally distributed. A random sample of 120 purchases is taken and the mean and standard deviation are computed to be 9.43 and 6.02 gallons, respectively. Determine the 98% confidence interval estimate of the population mean. 9.43 1.5503 You received a raw score of 50% on this question. Question #2 A sample of 850 people revealed that 544 of them preferred toothpaste to gel. With 98% confidence, estimate the population proportion of people who prefer paste to gel. .64 = 0.64 .0384 = 0.0384 You received a raw score of 100% on this question. Question #3 Not-So-Bad Air wants to know what proportion of their flights depart on time to within 5% with 98% confidence. What size sample do they need? 543 You received a raw score of 100% on this question.
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Unformatted text preview: Question #1 Suppose that the number of cigarettes a smoker smokes per day is normally distributed. A survey of 100 smokers asked how many cigarettes each had smoked that day. The average found was 16.12 and the sample standard deviation was 6.77. Estimate the population mean with 99% confidence. 16.12 1.7778 You received a raw score of 100% on this question. Question #2 Given a choice between an orange and an apple, 26 out of 80 people chose the apple. Estimate the 98% confidence interval. .325 = 0.325 .1220 = 0.122 You received a raw score of 100% on this question. Question #3 The Campus Association wants to estimate how many college freshman are homesick to within 2.5% with 90% confidence. How many freshman should they survey? 1083...
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This note was uploaded on 01/25/2011 for the course ECON 202 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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econ10 - Question #1 Suppose that the number of cigarettes...

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