s08_exam2_A

# s08_exam2_A - Statistics for Business Whitten Spring 2008...

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Questions 1–5. Classify the following random variables as either continuous or discrete . 1. Number of “heads” in six tosses of a nickel. (a) continuous (b) discrete 2. Number of times which a nickel must be tossed until the first “heads” appears. (a) continuous (b) discrete 3. The change given by a movie theater cashier to a customer who pays cash to see the movie, in dollars. (a) continuous (b) discrete 4. Length of time until a car’s fan belt breaks, in months. (a) continuous (b) discrete 5. Number of miles traveled by a salesperson each month. (a) continuous (b) discrete Questions 6–8. Voter registration records show that 68% of all voters in Indianapolis are registered as Repub- licans. To test a random-digit dialing device, you use the device to call 150 randomly-chosen residential telephones in Indianapolis. Of the registered voters contacted, 73% are registered Republicans. One of the two percentages in this problem is a parameter and the other is a statistic . 6. Is 68% a parameter or a statistic? (a) parameter (b) statistic 7. Is 73% a parameter or a statistic? (a) parameter (b) statistic
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