Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
7th Edition
ISBN: 9781337298353
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams
Publisher: South-Western College Pub
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Textbook Question
Chapter 7, Problem 48SE
A researcher reports survey results by stating that the standard error of the
population standard deviation is 500.
a. How large was the sample used in this survey?
b. What is the
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Reconsider the patient satisfaction data in Table 1. Fit a multiple regression model using both patient age and
severity as the regressors.
(a) Test for significance of regression.
(b) Test for the individual contribution of the two regressors. Are both regressor variables needed in the model?
(c) Has adding severity to the model improved the quality of the model fit? Explain your answer.
The output voltage of a power supply is assumed to be normally distributed. Sixteen observations taken at
random on voltage are as follows: 10.35, 9.30, 10.00, 9.96, 11.65, 12.00, 11.25, 9.58, 11.54, 9.95, 10.28, 8.37,
10.44, 9.25, 9.38, and 10.85.
(a) Test the hypothesis that the mean voltage equals 12 V against a two-sided alternative using a = 0.05.
(b) Construct a 95% two-sided confidence interval on μ.
(c) Test the hypothesis that σ² = 11 using α = 0.05.
(d) Construct a 95% two-sided confidence interval on σ.
(e) Construct a 95% upper confidence interval on σ.
(f) Does the assumption of normality seem reasonable for the output voltage?
Analyze the residuals from the regression model on the patient satisfaction data from Exercise 3. Comment on
the adequacy of the regression model.
Chapter 7 Solutions
Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
Ch. 7.2 - Consider a finite population with five elements...Ch. 7.2 - The 2012 American League consists of 14 baseball...Ch. 7.3 - The following data are from a simple random...Ch. 7.3 - Morningstar publishes ratings data on 1208 company...Ch. 7.3 - Prob. 13ECh. 7.5 - Suppose a random sample of size 50 is selected...Ch. 7.5 - The average full-sized front-loading Energy Star...Ch. 7.5 - Prob. 22ECh. 7.5 - Prob. 25ECh. 7.6 - A random sample of size 100 is selected from a...
Ch. 7.6 - The Wall Street Journal reported that the age at...Ch. 7.6 - Thirty-six percent of all Americans drink bottled...Ch. 7.6 - The Grocery Manufacturers of America reported that...Ch. 7.8 - Consider the Spontanversation sampling problem for...Ch. 7 - A researcher reports survey results by stating...Ch. 7 - Advertisers contract with Internet service...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...
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