PracticeMT1

# PracticeMT1 - BA 240 W Li Practice Exam 1 Problem 1...

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BA 240 W. Li 10/10/07 1 Practice Exam 1 Problem 1 : Consider the following 16 numbers: 88 53 64 59 72 91 59 68 76 55 62 65 84 62 59 77 a) Calculate the three Measures of Central Tendency. b) Describe the shape (skew) using part a). Justify your answer. c) Calculate the Five-number Summary. d) Calculate the standard deviation. e) Find the z-score for the maximum and for the minimum. f) Assume data is normal. Construct an interval that will include the middle 68.26% of the data set above. g) Count how many data actually fall into the interval in part f), and what is the percentage of the data? Problem 2 : Fred keeps track of his commute times. He has found that they have a normal shaped distribution with a mean of 46.2 minutes and a standard deviation of 11 minutes. a) What percentage of his commute times is between 13.2 minutes and 79.2 minutes? b) What percentage of time does it take him at most 68.2 minutes to get to work? Problem 3 : The following table lists the consumer ratings of 24 refrigerators. Rating

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## This note was uploaded on 11/16/2011 for the course BA 240 taught by Professor Li during the Fall '08 term at Bellevue College.

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PracticeMT1 - BA 240 W Li Practice Exam 1 Problem 1...

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