Practice Test 3_Bus2023_spring09_solutions

# Practice Test 3_Bus2023_spring09_solutions - Practice Test...

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Practice Test 3 –Bus 2023 Directions: For each question find the answer that is the best solution provided. There is only one correct answer. 1. 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 ANSWER: c 2. The number of customers that enter a store during one day is an example of 3. An experiment consists of measuring the speed of automobiles on a highway by the use of radar equipment. The random variable in this experiment is speed, measured in miles per hour. This random variable is a 4. A measure of the average value of a random variable is called a(n) 5. The expected value for a binomial probability distribution is a. E( x ) = pn (1 - n ) b. E( x ) = p (1 - p ) c. E( x ) = np d. E( x ) = np (1 - p ) ANSWER: c 1

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6. The variance for the binomial probability distribution is 7. Assume that you have a binomial experiment with p = 0.4 and a sample size of 50. The variance of this distribution is 8. 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 Exhibit 5-8 The student body of a large university consists of 60% female students. A random sample of 8 students is selected. 9. Refer to Exhibit 5-8. What is the random variable in this experiment? a. the 60% of female students b. the random sample of 8 students c. the number of female students out of 8 d. the student body size ANSWER: c
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