ps3 - Econ 41 Statistics for Economists Summer 2007...

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1 Econ 41 Statistics for Economists Summer 2007 Chunming Yuan Problem Set 3 MULTIPLE CHOICE 1. A discrete random variable is a random variable: a. that can assume any value in one or more intervals b. whose values are countable c. that is derived from a random population d. that is determined by random probability 2. The probability distribution table of a discrete random variable lists: a. the bottom half of the values that the random variable can assume and their corresponding probabilities b. all the values that the random variable can assume and their corresponding probabilities c. all the values that the random variable can assume and their corresponding frequencies d. the top half of the values that the random variable can assume and their corresponding probabilities 3. Which of the following is true for the probability distribution of a discrete random variable x? a . Σ P( x ) < 0 b . Σ P( x ) = 1 c . Σ P( x ) = 2 d . Σ P( x ) > 1 Use the following information for questions 4 – 9: The following table lists the probability distribution of a discrete random variable x . x P( x ) 2 .15 3 .32 4 .24 5 .13 6 .08 7 .06 8 .02 4. The probability of x = 7 is:
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2 5. The probability that x is less than or equal to 4 is: a. .47 b. .24 c. .53 d. .71 6. The probability that x is greater than or equal to 6 is: a. .08 b. .16 c. .84 d. .92 7. The probability that x assumes a value from 3 to 6 is: a. .77 b. .24 c. .56
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This note was uploaded on 10/02/2008 for the course ECON ECON 41 taught by Professor Yuan during the Summer '07 term at UCLA.

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ps3 - Econ 41 Statistics for Economists Summer 2007...

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