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ak_exam1_pam2100_fall08

ak_exam1_pam2100_fall08 - College of Human Ecology Cornell...

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College of Human Ecology Cornell University Ithaca, New York Department of Policy Analysis and Management PAM 2100 Intro Stats A. Sinan ¨ Un¨ur – Fall 2008 Prelim 1 – Answer October 2, 2008 Multiple Choice MC 1) Suppose you are told that the average score on the fall semester PAM 2100 prelim was 18 points and there were 50 students in the class. Then, you can be certain that ( a ) The number of students who scored lower than 18 points on the exam is equal to the number of students who scored higher than 118 18 points. ( b ) The sum of all students’ scores is 900. ( c ) Most students scored 18 points on the exam. ( d ) The difference between the highest and lowest score is 10 points. Answer : 1b . x i 50 = 18 x i = 900 . MC 2) For a research project involving human participants to be approved by the Institutional Review Board at Cornell University, participants must be able to withdraw from the study without penalty. ( a ) never ( b ) occasionally ( c ) usually ( d ) always Answer : 2d . There is no valid reason for forcing participants to stay in a study that might make them uncomfortable or even harm them. MC 3) Consider data on the fuel efficiency of 40 car models. Suppose Q 1 = 20 mpg and Q 2 = 32 Q 3 = 32 mpg. Which one of the following statements is correct?
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MC 4) According to the Census Bureau, the median earnings of male workers 25 and older in the U.S. was $41,539 in 2007. In the same year, average earnings for the same group of workers was $54,966. Based on this information, you can conclude that: Answer : 4a . This is the correct answer among all the answers given (implicitly assumes that the distribution is unimodal). MC 5) Assume that the speed at which people drive on I-81 is normally distributed. Suppose you are pulled over while driving at 80 mph on I-81. The state trooper tells you the while the average driver obeys the speed limit of 65 mph, 16% drive faster than you. What is the approximate standard deviation of the distribution of speeds at which people drive on I-81? Answer : 5c Looking at the normal distribution, we note that a z-score of approximately 1 corresponds to a right tail probability of 16%. Therefore, we have 80 - 65 s 1 .
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