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? A) 8.5 miles per gallon B) 16.5 miles per gallon C) 17 miles per gallon D) 25 miles per gallon Answer: A 4. Using the Normal tables, what is the approximate 25 th percentile of the standard normal distribution? A) 0.67 B) 1.96 C) 0.25 D) 2.5 Answer: A
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2 5. The scores on a university examination are normally distributed with a mean of 62 and a standard deviation of 11. If the bottom 10% of students will fail the course, what is the lowest mark that a student can have and still be awarded a passing grade? A) 62 B) 57 C) 48 D) 40 Answer: C 6. Many studies are trying to find a cure for chronic back pain. In one such study, a physician is comparing the medication currently being used (drug A) to a newly developed drug (drug B). Seventy-three volunteers, suffering from chronic back pain, are participating in this study. The physician’s assistant has a list of all 73 subjects and randomly divides the subjects into two groups. Group 1 will receive drug A and group 2
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This note was uploaded on 08/28/2011 for the course ECON 2500 taught by Professor Xianghongli during the Winter '11 term at York University.

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Midterm_2011_Winter_version1_soln - ECON 2500M Introductory...

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