An Introduction to Statistical Methods and Data Analysis
An Introduction to Statistical Methods and Data Analysis
7th Edition
ISBN: 9781305269477
Author: R. Lyman Ott, Micheal T. Longnecker
Publisher: Cengage Learning
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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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Chapter 10.11, Problem 22E

A political scientist is studying the impact of a political debate between candidates for governor in a small western state. The scientist wants to evaluate the proportion of registered votes who switch their preference after viewing the debate. The following table contain the data from 75 registered voters.

Chapter 10.11, Problem 22E, A political scientist is studying the impact of a political debate between candidates for governor

  1. a. Test whether there was a shift away from candidate A after the debate. Use α = .05. Carefully state your conclusion.
  2. b. Construct a 95% confidence interval for the change after the debate in the proportion of registered voters preferring candidate A.
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Chapter 10 Solutions

An Introduction to Statistical Methods and Data Analysis

Ch. 10.11 - Prob. 1ECh. 10.11 - For each of the following values for and n,...Ch. 10.11 - Prob. 3ECh. 10.11 - A random sample of 1,200 units is randomly...Ch. 10.11 - A public opinion polling agency plans to conduct a...Ch. 10.11 - The test for screening donated blood for the...Ch. 10.11 - National public opinion polls are often based on...Ch. 10.11 - Prob. 17ECh. 10.11 - A large retail lawn care dealer currently provides...Ch. 10.11 - Prob. 20E
Ch. 10.11 - Sludge is a dried product remaining from processed...Ch. 10.11 - A political scientist is studying the impact of a...Ch. 10.11 - The quality control department of a motorcycle...Ch. 10.11 - Refer to Exercise 10.29. a. Place 95% confidence...Ch. 10.11 - The article “Positive Aspects of Caregiving”...Ch. 10.11 - A study examining bomb hits in South London during...Ch. 10.11 - The fire department in a large city is examining...Ch. 10.11 - Prob. 53ECh. 10.11 - A carcinogenicity study was conducted to examine...
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