Ch01_Sect01_Keller MS_AISE TB

# Ch01_Sect01_Keller MS_AISE TB - CHAPTER 1 SECTION 1 WHAT IS...

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CHAPTER 1 SECTION 1: WHAT IS STATISTICS? MULTIPLE CHOICE 1. You take a random sample of 100 students at your university and find that their average GPA is 3.1. If you use this information to help you estimate the average GPA for all students at your university, then you are doing what branch of statistics? a. Descriptive statistics b. Inferential statistics c. Sample statistics d. Population statistics ANS: B PTS: 1 REF: SECTION 1.1 2. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 200 sound cards represent a: a. parameter. b. statistic. c. sample. d. population. ANS: C PTS: 1 REF: SECTION 1.1 3. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 5 years represents a: a. parameter. b. statistic. c. sample. d. population. ANS: B PTS: 1 REF: SECTION 1.1 4. A descriptive measure that is computed from a sample is called a: a. parameter. b. statistic. c. population. d. sample. ANS: B PTS: 1 REF: SECTION 1.1 5. A summary measure that is computed from a population is called a: a. sample. b. statistic. c. population. d. parameter. ANS: D PTS: 1 REF: SECTION 1.1 This edition is intended for use outside of the U.S. only, with content that may be different from the U.S. Edition. This may not be resold, copied, or distributed without the prior consent of the publisher.

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6. Which of the following is a measure of the reliability of a statistical inference? a. A population parameter. b. A significance level. c. A descriptive statistic. d. A sample statistic. ANS: B PTS: 1 REF: SECTION 1.1 7. A politician who is running for the office of governor of a state with 4 million registered voters commissions a survey. In the survey, 54% of the 5,000 registered voters interviewed say they plan to vote for her. The population of interest is: a. the 4 million registered voters in the state. b. the 5,000 registered voters interviewed. c. the 54% who plan to vote for her. d. all the residents of the state. ANS: A PTS: 1 REF: SECTION 1.1 8. A company has developed a new battery and wants to estimate its average lifetime. A random sample of 500 batteries is tested and the average lifetime of this sample is found to be 225 hours. The 225 hours is the value of a: a. parameter. b. statistic. c. sample. d. population. ANS: B PTS: 1 REF: SECTION 1.1 9. The process of using sample statistics to draw conclusions about population parameters is called: a. finding the significance level.
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## This note was uploaded on 04/08/2012 for the course ADMS 2320 taught by Professor Rochon during the Spring '08 term at York University.

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Ch01_Sect01_Keller MS_AISE TB - CHAPTER 1 SECTION 1 WHAT IS...

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