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Ch12_Sect01_Keller MS_AISE TB

# Ch12_Sect01_Keller MS_AISE TB - CHAPTER 12 SECTION 1...

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CHAPTER 12 SECTION 1: INFERENCE ABOUT A POPULATION MULTIPLE CHOICE 1. Researchers determined that 60 Kleenex tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: = 52 and s = 22. Suppose the test statistic does not fall in the rejection region at = 0.05. Which of the following conclusions is correct? a. At = 0.05, we do not reject H 0 . b. At = 0.05, we reject H 0 . c. At = 0.05, we accept H 0 . d. Both a and c. ANS: A PTS: 1 REF: SECTION 12.1 2. A robust estimator is one that is: 3. For statistical inference about the mean of a single population when the population standard deviation is unknown, the degrees for freedom for the t- distribution equal n 1 because we lose one degree of freedom by using the: 4. Researchers determined that 60 Kleenex tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: = 52 and s = 22. Suppose the alternative we wanted to test was H 1 : < 60. The correct rejection region for = 0.05 is: 5. A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal: a. 77.77 b. 72.23 c. 88.85 d. 77.27 ANS: A PTS: 1 REF: SECTION 12.1 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. A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: = \$50.50 and s 2 = 400. A 95% confidence interval for the average amount the credit card customers spent on their first visit to the chain's new store in the mall is:
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