Essentials Of Statistics
4th Edition
ISBN: 9781305093836
Author: HEALEY, Joseph F.
Publisher: Cengage Learning,
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Textbook Question
Chapter 7, Problem 7.2P
a. The students at Littlewood Regional High School cut an average of 3.3 classes per month. A random sample of 117 seniors averages 3.8 cuts per month, with a standard deviation of 0.53. Are seniors significantly different from the student body as a whole? (HINT: The wording of the research question suggests a two-tailed test. This
b. What if the research question were changed to "Do seniors cut a significantly greater number of classes"? How would the test conducted in problem 7.2a change? (HINT: This wording implies a one-tailed test of significance. How would the research hypothesis change? For the alpha you used in problem 7.2a, what would the value of Z(critical) be?)
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Imperial College London
Yale University
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University of Chicago
Johns Hopkins University
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ETH Zurich
University of Michigan
University of Toronto
Columbia University
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University College London
University of Washington
Duke University
Northwestern University
University of Tokyo
Georgia Institute of Technology
Pohang University of Science and Technology
University of California, Santa Barbara
University of British Columbia
University of North Carolina at Chapel Hill
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Chapter 7 Solutions
Essentials Of Statistics
Ch. 7 - a. For each situation, find Zcritical. Alpha Form...Ch. 7 - a. The students at Littlewood Regional High School...Ch. 7 - a. SW Statewide, social workers average 10.2 years...Ch. 7 - SOC Statewide, the average score on the verbal...Ch. 7 - SOC A random sample of 423 Asian Americans drawn...Ch. 7 - SOC A sample of 105 sanitation workers for the...Ch. 7 - a. SOC Statewide, the population as a whole...Ch. 7 - SOC A school system has assigned several hundred...Ch. 7 - A random sample of 26 local sociology graduates...Ch. 7 - SOC Nationally, the per capita monthly fuel oil...
Ch. 7 - SOC/CJ A survey shows that 10 of the population is...Ch. 7 - SOC/CJ A random sample of 113 felons convicted of...Ch. 7 - In a recent statewide election. 55 of the voters...Ch. 7 - SOC/CJ Statewide, the police clear by arrest 35 of...Ch. 7 - SOC/SW A researcher has compiled a file of...Ch. 7 - SW You are the head of an agency seeking funding...Ch. 7 - PA The city manager has received a complaint from...Ch. 7 - SW The following essay questions review the basic...Ch. 7 - SOC A researcher is studying changes in the...
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