2nd Edition

ISBN: 9780321978271

Author: Robert Gould, Colleen N. Ryan

Publisher: PEARSON

Concept explainers

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 7, Problem 51SE

High School Diplomas (Example 8) In a simple random sample of 1500 young Americans, 87 % had earned a high school diploma.

a. What is the standard error for this estimate of the percentage of all young Americans who earned a high school diploma?

b. Find the margin of error, using a 95 % confidence level, for estimating the percentage of all young Americans who earned a high school diploma.

c. Report the 95 % confidence interval for the percentage of all young Americans who earned a high school diploma.

d. Suppose that in the past, 80 % of all young Americans earned high school diplomas. Does the confidence interval you found in part c support or refute the claim that the percentage of young Americans who earn high school diplomas has increased? Explain.

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Chapter 7, Problem 50SE

Chapter 7, Problem 52SE

Chapter 7 Solutions

Introductory Statistics (2nd Edition)

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Solution Summary: The author calculates the standard error for the estimate of the percentage of all young Americans who earned a high school diploma.

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