10th Edition

ISBN: 9780321989178

Author: Neil A. Weiss

Publisher: PEARSON

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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 12.2, Problem 86E

In Exercises 12.85–12.94, use Procedure 12.2 on page 557 to perform an appropriate hypothesis test. Be sure to check the conditions for using that procedure.

12.86 Christmas Presents. The Arizona Republic conducted a telephone poll of 758 Arizona adults who celebrate Christmas. The question asked was, “In your family, do you open presents on Christmas Eve or Christmas Day?” Of those surveyed, 394 said they wait until Christmas Day.

a. Determine and interpret the sample proportion.
b. At the 5% significance level, do the data provide sufficient evidence to conclude that a majority (more than 50%) of Arizona families who celebrate Christmas wait until Christmas Day to open their presents?

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Chapter 12.2, Problem 85E

Chapter 12.2, Problem 87E

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Chapter 12 Solutions

Introductory Statistics (10th Edition)

Ch. 12.1 - Why is statistical inference generally used to...Ch. 12.1 - Prob. 3E Ch. 12.1 - Prob. 4E Ch. 12.1 - Regarding a sample proportion: a. What is it? b....Ch. 12.1 - Regarding the phrase number of successes: a. For...Ch. 12.1 - For what is the phrase number of failures an...Ch. 12.1 - Explain the relationships among the sample...Ch. 12.1 - Prob. 9E Ch. 12.1 - Repeat parts (b)(e) of Exercise 12.9 for samples...Ch. 12.1 - Prob. 11E

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Solution Summary: The author calculates the sample proportion for a given number of success, stating that 52% of Arizonafamilies wait until Christmas day to open their presents.

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