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Comm291_Final_Exam_2003

# Comm291_Final_Exam_2003 - The University of British...

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Question 1 (Total 20 marks) - Multiple Choice a) There are 25 non-identical numbers on a list. The average is 20. One number, which happens to equal 20, is removed from the list. The average of the remaining 24 numbers is: __A. less than 20 __B. equal to 20 __C. more than 20 __D. depends on the SD __E. cannot tell without knowing all the numbers. b) A soft-drink machine can be regulated so that it discharges an average of μ ounces per cup. If the ounces of fill are normally distributed with a standard deviation of 0.4 oz. what value should μ be set at so that 6-oz. cups will overflow only 2% of the time? __A. 6.82 __B. 6.00 __C. 5.18 __D. 5.60 __E. None of these c) A simple random sample of 50 undergraduates at University A found that 60% of those sampled felt that drinking was a problem among university students. A simple random sample of 50 undergraduates at University B found that 70% felt that drinking was a problem among university students. The number of undergraduates at University A is about 2000 while the number at University B is approximately 40,000. We conclude that: __A. the sample from Univ. A has much less sampling variability than that from Univ. B. __B. the sample from Univ. A has much more sampling variability than that from Univ. B. __C. the sample from Univ. A has almost the same
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Comm291_Final_Exam_2003 - The University of British...

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