# ps4 - Econ 41 Statistics for Economists Summer 2007...

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1 Econ 41 Statistics for Economists Summer 2007 Chunming Yuan Problem Set 4 MULTIPLE CHOICE 1. Which of the following is not a characteristic of the normal distribution? a. The total area under the curve is 1.0 b. The curve is symmetric about the mean c. The value of the mean is always greater than the value of the standard deviation d. The two tails of the curve extend indefinitely 2. The tails of a normal distribution curve: a. meet the horizontal axis at z = 3.0 b. never meet or cross the horizontal axis c. cross the horizontal axis at z = 4.0 d. are nonsymmetric 3. For a normal distribution, the z value for the mean is always: 4. For the standard normal distribution, the area to the right of z = –.78 is: 5. For the standard normal distribution, the area between z = .79 and z = 2.67 is: 6. Let x have a normal distribution with a mean of 60 and a standard deviation of 4. The z value for x = 53 is: a. 1.75 b. 1.25 c. –1.75 d. –1.25

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