Midterm_2011_Winter_version1_soln

Midterm_2011_Winter_version1_soln - ECON 2500M Introductory...

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1 ECON 2500M: Introductory Statistics for Economists Midterm Version 1 - Solutions I. (20 points) Multiple choice questions, NO explanation needed. Use the following to answer questions 1 – 3. Data on the mileage of 20 randomly selected cars is listed below. The values are ordered for convenience. 12 13 15 16 16 17 18 18 19 19 20 20 22 23 24 26 26 27 27 29 1. What is the median mileage for these 20 cars? A) 17.5 miles per gallon B) 16 miles per gallon C) 19.5 miles per gallon D) 24 miles per gallon Answer: C 2. If the value 29 were mis-recorded and should really be 21, what would the median mileage be for these 20 cars? A) It would change to 21 miles per gallon. B) It would stay the same. C) It would change to 18 miles per gallon. D) We cannot determine this from the given information. Answer: B 3. What is the interquartile range for the mileage data? 4. Using the Normal tables, what is the approximate 25 th percentile of the standard normal distribution?
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