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CHAPTER 5DISCRETE PROBABILITY DISTRIBUTIONS MULTIPLE CHOICE 1. A numerical description of the outcome of an experiment is called a a. descriptive statistic b. probability function c. variance d. random variable ANS: D PTS: 1 TOP: Discrete Probability Distributions 2. A random variable that can assume only a finite number of values is referred to as a(n) a. infinite sequence b. finite sequence c. discrete random variable d. discrete probability function ANS: C PTS: 1 TOP: Discrete Probability Distributions 3. A probability distribution showing the probability of x successes in n trials, where the probability of success does not change from trial to trial, is termed a a. uniform probability distribution b. binomial probability distribution c. hypergeometric probability distribution d. normal probability distribution ANS: B PTS: 1 TOP: Discrete Probability Distributions 4. Variance is a. a measure of the average, or central value of a random variable b. a measure of the dispersion of a random variable c. the square root of the standard deviation d. the sum of the squared deviation of data elements from the mean ANS: B PTS: 1 TOP: Discrete Probability Distributions 5. A continuous random variable may assume a. any value in an interval or collection of intervals b. only integer values in an interval or collection of intervals c. only fractional values in an interval or collection of intervals d. only the positive integer values in an interval ANS: A PTS: 1 TOP: Discrete Probability Distributions 6. A description of the distribution of the values of a random variable and their associated probabilities is called a a. probability distribution b. random variance c. random variable d. expected value ANS: A PTS: 1 TOP: Discrete Probability Distributions 7. Which of the following is a required condition for a discrete probability function? a. f(x) = 0 for all values of x b. f(x) 1 for all values of x c. f(x) < 0 for all values of x d. f(x) = 1 for all values of x ANS: D PTS: 1 TOP: Discrete Probability Distributions 8. A measure of the average value of a random variable is called a(n) a. variance b. standard deviation c. expected value d. coefficient of variation ANS: C PTS: 1 TOP: Discrete Probability Distributions 9. Which of the following is not a required condition for a discrete probability function? a. f(x) 0 for all values of x b. f(x) = 1 for all values of x c. f(x) = 0 for all values of x d. f(x) 1 for all values of x ANS: C PTS: 1 TOP: Discrete Probability Distributions 10. The standard deviation is the a. variance squared b. square root of the sum of the deviations from the mean c. same as the expected value d. positive square root of the variance ANS: D PTS: 1 TOP: Discrete Probability Distributions 11. The variance is a measure of dispersion or variability of a random variable. It is a weighted average of the a. square root of the deviations from the mean b. square root of the deviations from the median c. squared deviations from the median... View Full Document