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# ps2 - 1 Econ 41 Statistics for Economists Summer 2007...

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Unformatted text preview: 1 Econ 41 Statistics for Economists Summer 2007 Chunming Yuan Problem Set 2 MULTIPLE CHOICE 1. An outcome is: a. what is observed when an experiment is performed b. what happens when you do not perform an experiment c. a collection of many events d. a collection of at least two sample spaces 2. A compound event includes: a. at least three outcomes b. at least two outcomes c. one and only one outcome d. all outcomes of an experiment 3. Two households are randomly selected and it is observed whether or not each of them owns a telephone answering machine. The total number of outcomes for this experiment is: a. six b. eight c. two d. four 4. A box contains a few red and a few white marbles. After randomly drawing two marbles from this box, you observe their color. Which of the following is an example of a simple event? a. At most one marble is red. b. At least one marble is white. c. Both marbles are white. d. Not more than one marble is red. 5. According to the classical probability rule, the probability of a simple event is: a. the total number of outcomes for the experiment divided by 1 b. 1 divided by the sample space c. 1 divided by the total number of outcomes for the experiment d. 1 divided by the compound event 6. If you roll a die once, the probability of obtaining an odd number is: a. .60 b. .25 c. .17 d. .50 2 7. A research firm polls 25 persons to determine their opinions on income tax reforms. The probabilities that a person is in favor of income tax reforms, he/she is against it, and he/she has no opinion should all add up to: a. .00 b. .85 c. 1.00 d. more than 1.0 8. Two events are independent if the occurrence of one event: a. affects the probability of the occurrence of the other event b. does not affect the probability of the occurrence of the other event c. means that second event cannot occur d. means that second event is definite to occur...
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ps2 - 1 Econ 41 Statistics for Economists Summer 2007...

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