Basic Business Statistics
14th Edition
ISBN: 9780134684840
Author: BERENSON, Mark L., Levine, David M., Szabat, Kathryn A.
Publisher: Pearson,
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Textbook Question
Chapter 2, Problem 35PS
The following is a stern-and0-leaf display representing the amount of gasoline purchase, in gallons (with leaves in tenths of gallons), for a sample of 25 cars that use a particular service station on the New Jersey Tumpike:
a. Construct an ordered array.
b. Which of these two displays seems to provide more information? Discuss.
c. What amount of gasoline (in gallons) is more likely to be purchased?
d. Is there a concentration of the purchase amounts in the center of the distribution?
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Reconsider the patient satisfaction data in Table 1. Fit a multiple regression model using both patient age and
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(b) Test for the individual contribution of the two regressors. Are both regressor variables needed in the model?
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The output voltage of a power supply is assumed to be normally distributed. Sixteen observations taken at
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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.
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(d) Construct a 95% two-sided confidence interval on σ.
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Analyze the residuals from the regression model on the patient satisfaction data from Exercise 3. Comment on
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Chapter 2 Solutions
Basic Business Statistics
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