Bundle: Statistics for Business & Economics, Loose-Leaf Version, 13th + MindTap Business Statistics with XLSTAT, 1 term (6 months) Printed Access Card
Bundle: Statistics for Business & Economics, Loose-Leaf Version, 13th + MindTap Business Statistics with XLSTAT, 1 term (6 months) Printed Access Card
13th Edition
ISBN: 9781337148092
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Chapter 11.1, Problem 11E

At the end of 2008, the variance in the semiannual yields of overseas government bond was σ2 = .70. A group of bond investors met at that time to discuss future trends in overseas bond yields. Some expected the variability in overseas bond yields to increase and others took the opposite view. The following table shows the semiannual yields for 12 overseas countries as of March 6, 2009 (Barron’s, March 9, 2009).

Chapter 11.1, Problem 11E, At the end of 2008, the variance in the semiannual yields of overseas government bond was 2 = .70. A

  1. a. Compute the mean, variance, and standard deviation of the overseas bond yields as of March 6, 2009.
  2. b. Develop hypotheses to test whether the sample data indicate that the variance in bond yields has changed from that at the end of 2008.
  3. c. Use α = .05 to conduct the hypothesis test formulated in part (b). What is your conclusion?
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Sand and clay studies were conducted at a site in California. Twelve consecutive depths, each about 15 cm deep, were studied and the following percentages of sand in the soil were recorded.  27.3 34.6 30.6 27.8 33.4 31.5 ​ 27.3 31.2 32.0 24.7 24.4 28.2 ​ Test this sequence for randomness about the median. Converting this sequence of numbers to a sequence of symbols A and B, where A indicates a value above the median and B denotes a value below the median gives BAABAABAABBB. Verify that the number of runs is 7, the lower critical number is 3, and the upper critical number is 11. Use a 5% level of significance. State the conclusion of the test and interpret your results.

Chapter 11 Solutions

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