Chapter 6-4 & 6-5 Questions (STAT-200)

# Chapter 6-4& - Tommy Y Choi STAT-200 OL1 Chapter 6-4 Questions Problem 2 4 6 14 2 Sampling Distribution Data Set 24 in Appendix B includes a

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Tommy Y. Choi STAT-200 OL1 Chapter 6-4 Questions: 2) Sampling Distribution: Data Set 24 in Appendix B includes a sample of FICO Credit Rating Scores from randomly selected consumers. If we investigate this sample by constructing a histogram and finding the sample mean and standard deviation, are we investigating the sampling distribution of the mean? Why or why not? a) Answers: 4) Sampling With Replacements: Give two reasons why statistical methods tend to be based on the assumption that sampling is conducted with replacements, instead of without replacement. a) Answers : (1) When selecting a relatively small sample from a large population, it makes no significant difference whether we sample with replacements or without replacements. (2) sampling with replacements results in independent events that are unaffected by previous outcomes and independent events are easier to analyze and result in simpler calculations and formulas. 6) Unbiased Estimators: Which of the following statistics are unbiased estimators of population parameters? a) Sample mean used to estimate a population mean b) Sample median used to estimate a population median c) Sample proportion used to estimate a population proportion d) Sample variance used to estimate a population variance e) Sample standard deviation used to estimate a population standard deviation f) Sample range used to estimate a population range a) Unbiased Estimators

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## This note was uploaded on 10/03/2010 for the course STAT 200 taught by Professor Hirschorn during the Fall '10 term at University of Maryland Eastern Shore.

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Chapter 6-4& - Tommy Y Choi STAT-200 OL1 Chapter 6-4 Questions Problem 2 4 6 14 2 Sampling Distribution Data Set 24 in Appendix B includes a

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