quiz2A - UCLA Econ 41 Statistics for Economists Second...

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UCLA Econ 41 – Statistics for Economists Second Quiz, July 23, 20007 Version A 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, 10pts each):
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1 I. Multiple Choices: only one is best answer (5 points each) 1. Suppose you are analyzing four different brands of soda. The sodium content, in milligrams, of one can of each of these brands is: 35 50 55 42 You take a sample of two of these values. Let x be the mean of this sample. What are the mean and standard deviation x? a). mean = 45, standard deviation = 8.813 b). mean = 45.5, standard deviation = 8.813 c). mean = 50, standard deviation = 3.598 d). mean = 45.5, standard deviation = 4.406 e). none of the above 2. The length of time before a cell phone using the “Superdurable” battery has to be
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quiz2A - UCLA Econ 41 Statistics for Economists Second...

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