SME_8e_Ch_10_Section_1 - CHAPTER 10 SECTION 1 INTRODUCTION...

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1 CHAPTER 10 SECTION 1: INTRODUCTION TO ESTIMATION MULTIPLE CHOICE 1. Which of the following is not a characteristic for a good estimator? a. Being unbiased b. Being consistent c. Having relative efficiency d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 10.1 2. A point estimator is defined as: a. a range of values that estimates an unknown population parameter. b. a range of values that estimates an unknown sample statistic. c. a single value that estimates an unknown population parameter. d. a single value that estimates an unknown sample statistic. ANS: C PTS: 1 REF: SECTION 10.1 3. An unbiased estimator of a population parameter is defined as: a. an estimator whose expected value is equal to the parameter. b. an estimator whose variance is equal to one. c. an estimator whose expected value is equal to zero. d. an estimator whose variance goes to zero as the sample size goes to infinity. ANS: A PTS: 1 REF: SECTION 10.1 4. An estimator is said to be consistent if: a. it is an unbiased estimator. b. the variance of the estimator is zero. c. the difference between the estimator and the population parameter stays the same as the sample size grows larger. d. the difference between the estimator and the population parameter grows smaller as the sample size grows larger. ANS: D PTS: 1 REF: SECTION 10.1 5. If there are two unbiased estimators of a population parameter available, the one that has the smallest variance is said to be: a. a biased estimator. b. relatively efficient. c. consistent. d. relatively unbiased. ANS: B PTS: 1 REF: SECTION 10.1
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2 6. Which of the following statements is correct? a. The sample mean is an unbiased estimator of the population mean. b. The sample proportion is an unbiased estimator of the population proportion. c. The difference between two sample means is an unbiased estimator of the difference between two population means. d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 10.1 7. Which of the following statements is true? a. The sample mean is relatively more efficient than the sample median. b. The version of the sample variance where you divide by n is biased. c.
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This note was uploaded on 09/28/2010 for the course FINOPMGT 250 taught by Professor Kumar during the Spring '10 term at University of Massachusetts Boston.

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SME_8e_Ch_10_Section_1 - CHAPTER 10 SECTION 1 INTRODUCTION...

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