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Bundle: Statistics for Business & Economics, Loose-leaf Version, 13th + MindTap Business Statistics with XLSTAT, 2 terms (12 months) Printed Access Card
13th Edition
ISBN: 9781337127264
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Textbook Question
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).
- a. Compute the
mean , variance, and standard deviation of the overseas bond yields as of March 6, 2009. - 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.
- c. Use α = .05 to conduct the hypothesis test formulated in part (b). What is your conclusion?
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Chapter 11 Solutions
Bundle: Statistics for Business & Economics, Loose-leaf Version, 13th + MindTap Business Statistics with XLSTAT, 2 terms (12 months) Printed Access Card
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Ch. 11.1 - At the end of 2008, the variance in the semiannual...Ch. 11.1 - A Fortune study found that the variance in the...Ch. 11.2 - Find the following F distribution values from...Ch. 11.2 - A sample of 16 items from population 1 has a...Ch. 11.2 - Consider the following hypothesis test....Ch. 11.2 - Investors commonly use the standard deviation of...Ch. 11.2 - Most individuals are aware of the fact that the...Ch. 11.2 - Data were collected on the top 1000 financial...Ch. 11.2 - The variance in a production process is an...Ch. 11.2 - On the basis of data provided by a Romac salary...Ch. 11.2 - Many smartphones, especially those of the...Ch. 11.2 - A research hypothesis is that the variance of...Ch. 11 - Because of staffing decisions, managers of the...Ch. 11 - Initial public offerings (IPOs) of stocks are on...Ch. 11 - The estimated daily living costs for an executive...Ch. 11 - Part variability is critical in the manufacturing...Ch. 11 - The filling variance for boxes of cereal is...Ch. 11 - City Trucking, Inc., claims consistent delivery...Ch. 11 - A sample of 9 days over the past six months showed...Ch. 11 - A sample standard deviation for the number of...Ch. 11 - Is there any difference in the variability in golf...Ch. 11 - The grade point averages of 352 students who...Ch. 11 - The accounting department analyzes the variance of...Ch. 11 - Two new assembly methods are tested and the...
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