Eco5_exam2 - Eco 5 Spring 06 Name: Exam #2 Multiple Choice...

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Eco 5 Spring 06 Name: Exam #2 Multiple Choice Questions ( 20 points ) 1. 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 2. 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 3. Which of the following is a required condition for a discrete probability function? a. Σ f(x) = 0 b. f(x) 1 for all values of x c. f(x) < 0 d. Σ f(x) = 1 The student body of a large university consists of 60% female students. A random sample of 8 students is selected. 4. What is the probability that among the students in the sample exactly two are female? a. 0.0896 b. 0.2936 c. 0.0413 d. 0.0007 5. What is the probability that among the students in the sample at least 7 are female? a. 0.1064 b. 0.0896 c. 0.0168
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d. 0.8936 6. Twenty percent of the students in a class of 100 are planning to go to graduate school. The standard deviation of this binomial distribution is
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Eco5_exam2 - Eco 5 Spring 06 Name: Exam #2 Multiple Choice...

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