3rd Edition

ISBN: 9780135188927

Author: Gould, Robert, Ryan, Colleen N. (colleen Nooter)

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 1, Problem 11SE

Facebook Wall Posts (Example 2) A student shared data from the StatCrunch Friend Data Application. Data on gender and number of wall posts for a sample of friends are shown below. (Source: StatCrunch, Facebook Friend Data, posted 2/13/14)

Chapter 1, Problem 11SE, Facebook Wall Posts (Example 2) A student shared data from the StatCrunch Friend Data Application.

a. Is the format of this data set stacked or unstacked?

b. Explain the coding. What do 1 and 0 represent?

c. If you answered “stacked” in part a, then unstack the data into two columns labeled Male and Female. If you answered “unstacked,” then stack the data into one column and choose a appropriate name for the stacked variable.

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Chapter 1, Problem 10SE

Chapter 1, Problem 12SE

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Chapter 1 Solutions

Introductory Statistics

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Solution Summary: The author explains the format of the data set in stacked format, which consists of two variables, labelled as ‘male’ and ‘wall posts’.

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