TB Ch 09-1

# TB Ch 09-1 - CHAPTER 9 CONFIDENCE INTERVAL ESTIMATION...

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CHAPTER 9 CONFIDENCE INTERVAL ESTIMATION MULTIPLE CHOICE QUESTIONS In the following multiple-choice questions, please circle the correct answer. 1. The confidence interval for a proportion is based on the assumption of a large sample size. A rule of thumb for checking the validity of this assumption is if , (1 ), , and (1 ) L L U U np n p np n p - - are all greater than what value? a. 0 b. n c. 2 d. 3 e. 5 ANSWER: e 2. When the samples we want to compare are paired in some natural way, such as pretest/posttest for each person or husband/wife pairs, a more appropriate form of analysis is to not compare two separate variables, but their . a. difference b. sum c. ratio d. total e. product ANSWER: a 3. Confidence intervals are a function of which of the following three things? 185

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Chapter 9 4. The chi-square and F distributions are used primarily to make inferences about population ___________. 5. If you increase the confidence level, the confidence interval . 6. A random sample allows us to use: a. the rules of probabilities b. the rules of large numbers c. the laws of parameters d. the laws of distributions e. the laws of gravity ANSWER: a 7. Suppose there are 500 accounts in a population. You sample 50 of them and find a sample total of \$5,000. What would be your estimate for the population total? 8. Suppose there are 400 accounts in a population. You sample 50 of them and find a sample mean of \$500. What would be your estimate for the population total? 186
Confidence Interval Estimation 9. When we replace with the sample standard deviation (s), we introduce a new source of variability and the sampling distribution becomes the . 10. Another commonly used random mechanism, besides a simple random sample, is called: a. interval estimation b. a random hypothesis test c. a randomized experiment d. a nuisance sample ANSWER: c

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