3rd Edition

ISBN: 9780135163146

Author: Gould

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 84SE

Preschool: Just the Girls The Perry Preschool Project was created in the early 1960s by David Weikart in Ypsilanti, Michigan. In this project, 123 African American children were randomly assigned to one of two groups: One group enrolled in the Perry Preschool, and one group did not enroll. Follow-up studies were done for decades. One research question was whether attendance at preschool had an effect on high school graduation. The table shows whether the students graduated from regular high school or not and includes girls only (Schweinhart et al. 2005).

Chapter 7, Problem 84SE, Preschool: Just the Girls The Perry Preschool Project was created in the early 1960s by David

a. Find the percentages that graduated for both groups, and compare them descriptively. Does this suggest that preschool was associated with a higher graduation rate?

b. Which of the conditions fail so that we cannot use a confidence interval for the difference between proportions?

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Chapter 7, Problem 83SE

Chapter 7, Problem 85CRE

Chapter 7 Solutions

INTRODUCTORY STATISTICS (LOOSELEAF)

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Solution Summary: The author compares the percentages of girls who graduated for both the groups and states whether preschool was associated with a higher graduation rate for these children.

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