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quiz2B

# quiz2B - UCLA Econ 41 Statistics for Economists Second Quiz...

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UCLA Econ 41 – Statistics for Economists Second Quiz, July 23, 20007 Version B Student Name: ____________________ (Last) __________________ (First) *Please write your registered name Student ID: ______-______-______ e-mail: ____________________ * Ex: 123 - 456 - 789 Signature: ______________________________ ******************************************************************** You need ONLY turn in THIS PAGE. (Answers written elsewhere will not be graded ) Your Answers: I. Multiple Choice: 1.____ 2.____ 3.____ 4.____ 5.____ (5 points each) 6.____ 7.____ 8.____ II. Essay Question (20 points, 10 pts each):

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1 I. Multiple Choices: only one is best answer (5 points each) 1. Suppose 20% of the cars produced by BMW have a problem with the steering wheel. The probability that a quality inspector detects a car that has such a problem is 80%. The probability that the inspector wrongly classifies a car with no problems as defective is 20%. If the inspector thinks that a randomly chosen BMWhas a problem, what is the probability that is has indeed a problem? a) 14/41 b) 3/10 c) 1/2 d) 9/10 e) None of the above 2. From the previous problem, now assume that every time the inspector thinks that a car is has a problem he takes the car out of the market (and the car won’t be offered for sale).
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