Elementary Statistics

12th Edition

ISBN: 9780321837936

Author: Mario F. Triola

Publisher: PEARSON

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Textbook Question

Chapter 9.2, Problem 4BSC

Using Confidence Intervals

a. Assume that we want to use a 0.05 significance level to test the claim that p₁, < p₂. If we want to test that claim by using a confidence interval, what confidence level should we use?
b. If we test the claim in part (a) using the sample data in Exercise 1, we get this confidence interval: −0.000508 < p₁, − p2 < −0.000309. What does this confidence interval suggest about the claim?
c. In general, when dealing with inferences for two population proportions, which two of the following are equivalent: confidence interval method; P-value method; critical value method?

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Chapter 9.2, Problem 3BSC

Chapter 9.2, Problem 5BSC

Chapter 9 Solutions

Elementary Statistics

Ch. 9.2 - Verifying Requirements In the largest clinical...Ch. 9.2 - Verifying Requirements In the largest clinical...Ch. 9.2 - Hypotheses and Conclusions Refer to the hypothesis...Ch. 9.2 - Using Confidence Intervals a. Assume that we want...Ch. 9.2 - Interpreting Displays. In Exercises 5 and 6, use...Ch. 9.2 - Interpreting Displays. In Exercises 5 and 6, use...Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Prob. 8BSC Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Testing Claims About Proportions. In Exercises...

Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Prob. 12BSC Ch. 9.2 - Tennis Challenges Since the Hawk-Eye instant...Ch. 9.2 - Police Gunfire In a study of police gunfire...Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Marathon Finishers In a recent New York City...Ch. 9.2 - Overlap of Confidence Intervals In the article On...Ch. 9.2 - Equivalence of Hypothesis Test and Confidence...Ch. 9.2 - Determining Sample Size The sample size needed to...Ch. 9.3 - Independent and Dependent Samples Which of the...Ch. 9.3 - Interpreting Confidence Intervals If the heights...Ch. 9.3 - Interpreting Confidence Intervals What does the...Ch. 9.3 - Hypothesis Tests and Confidence Intervals a. In...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - Prob. 6BSC Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - Prob. 8BSC Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - Prob. 10BSC Ch. 9.3 - Prob. 11BSC Ch. 9.3 - Prob. 12BSC Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - In Exercises 5-20, assume that the two samples are...Ch. 9.3 - Prob. 21BSC Ch. 9.3 - Large Data Sets. In Exercises 21-24, use the...Ch. 9.3 - Large Data Sets. In Exercises 21-24, use the...Ch. 9.3 - Large Data Sets. In Exercises 21-24, use the...Ch. 9.3 - Prob. 25BB Ch. 9.3 - Pooling. In Exercises 25 and 26, assume that the...Ch. 9.3 - Prob. 27BB Ch. 9.3 - Prob. 28BB Ch. 9.3 - Prob. 29BB Ch. 9.4 - True Statements? For the methods of this section,...Ch. 9.4 - Prob. 2BSC Ch. 9.4 - Prob. 3BSC Ch. 9.4 - Confidence Intervals If we use the sample data in...Ch. 9.4 - Prob. 5BSC Ch. 9.4 - Prob. 6BSC Ch. 9.4 - Calculations with Paired Sample Data. In Exercises...Ch. 9.4 - Prob. 8BSC Ch. 9.4 - Prob. 9BSC Ch. 9.4 - Prob. 10BSC Ch. 9.4 - Prob. 11BSC Ch. 9.4 - Prob. 12BSC Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - In Exercises 516, use the listed paired sample...Ch. 9.4 - Prob. 16BSC Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - In Exercises 920, assume that the paired sample...Ch. 9.4 - Prob. 21BSC Ch. 9.4 - Prob. 22BSC Ch. 9.4 - Prob. 23BSC Ch. 9.4 - Prob. 24BSC Ch. 9.4 - Prob. 25BB Ch. 9.5 - F Test Statistic a. If s12 represents the larger...Ch. 9.5 - F Test If using Data Set 1 in Appendix B for a...Ch. 9.5 - Prob. 3BSC Ch. 9.5 - Prob. 4BSC Ch. 9.5 - Prob. 5BSC Ch. 9.5 - Prob. 6BSC Ch. 9.5 - Hypothesis Tests of Claims About Variation. In...Ch. 9.5 - Prob. 8BSC Ch. 9.5 - Prob. 9BSC Ch. 9.5 - Prob. 10BSC Ch. 9.5 - Prob. 11BSC Ch. 9.5 - Prob. 12BSC Ch. 9.5 - Prob. 13BSC Ch. 9.5 - Prob. 14BSC Ch. 9.5 - Hypothesis Tests of Claims About Variation. In...Ch. 9.5 - Prob. 16BSC Ch. 9.5 - Prob. 17BSC Ch. 9.5 - Prob. 18BSC Ch. 9.5 - Prob. 19BB Ch. 9.5 - Prob. 20BB Ch. 9.5 - Prob. 21BB Ch. 9 - In Exercises 1-4, use the following surrey...Ch. 9 - In Exercises 1-4, use the following surrey...Ch. 9 - In Exercises 1-4, use the following surrey...Ch. 9 - In Exercises 1-4, use the following survey...Ch. 9 - Listed below are the costs (in dollars) of...Ch. 9 - Prob. 6CQQ Ch. 9 - Prob. 7CQQ Ch. 9 - Prob. 8CQQ Ch. 9 - Prob. 9CQQ Ch. 9 - Prob. 10CQQ Ch. 9 - Prob. 1RE Ch. 9 - Prob. 2RE Ch. 9 - Airbags Save Lives In a study of the effectiveness...Ch. 9 - Are Flights Cheaper When Scheduled Earlier? Listed...Ch. 9 - Self-Reported and Measured Female Heights As part...Ch. 9 - Eyewitness Accuracy of Police Does stress affect...Ch. 9 - Prob. 7RE Ch. 9 - Effect of Blinding Among 13,200 submitted...Ch. 9 - Comparing Means The baseline characteristics of...Ch. 9 - Comparing Variation Use the sample data from...Ch. 9 - Heights of Mothers and Daughters. In Exercises...Ch. 9 - Prob. 2CRE Ch. 9 - Prob. 3CRE Ch. 9 - Heights of Mothers and Daughters. In Exercises...Ch. 9 - Prob. 5CRE Ch. 9 - Dark Survey In a survey of 1032 Americans,...Ch. 9 - Backup Generator The USA Today web site posted...Ch. 9 - Juke Survey Late-night talk show host David...Ch. 9 - Normal Distribution Based on the measurements in...Ch. 9 - Prob. 10CRE Ch. 9 - Prob. 1FDD Ch. 9 - Critical Thinking: Ages of workers killed in the...Ch. 9 - Critical Thinking: Ages of workers killed in the...Ch. 9 - Prob. 4FDD Ch. 9 - Prob. 5FDD Ch. 9 - Prob. 6FDD

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Solution Summary: The author explains how the confidence level is used to test the claim that the rate of polio is less for children given the Salk vaccine.

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