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UCLA Econ 41 – Statistics for Economists
Second Quiz, July 23, 20007
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I. Multiple Choice:
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2.____ 3.____
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5.____
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8.____
II. Essay Question (20 points, 10pts each):
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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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 Summer '07
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