Essentials of Statistics, Books a la Carte Edition (5th Edition)
5th Edition
ISBN: 9780321926739
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 8.3, Problem 36BB
Using Confidence Intervals to Test Hypotheses When analyzing the last digits of telephone numbers in Port Jefferson, it is found that among 1000 randomly selected digits, 1 19 are zeros. If the digits are randomly selected, the proportion of zeros should be 0.1.
- a. Use the critical value method with a 0.05 significance level to test the claim that the proportion of zeros equals 0.1.
- b. Use the P-value method with a 0.05 significance level to test the claim that the proportion of zeros equals 0.1.
- c. Use the sample data to construct a 95% confidence
interval estimate of the proportion of zeros. What does the confidence interval suggest about the claim that the proportion of zeros equals 0.1 ? - d. Compare the results from the critical value method, the P-value method, and the confidence interval method. Do they all lead to the same conclusion?
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Chapter 8 Solutions
Essentials of Statistics, Books a la Carte Edition (5th Edition)
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