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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Chapter 13, Problem 23SE

Meat-Eating Behavior (Example 4) A researcher was interested in the ethics of eating meat, so he studied and compared ethicists (philosophy professors who taught ethics) with professors who taught other subjects to find out whether ethicists eat less meat (Schwitzgebel and Rust 2009). The subjects were asked how many meals they eat per week that include meat. The output provided are from a random sample from the full study. Vegetarians (who eat no meat) were excluded. Assume the shapes and spreads of the distributions are the same.

a. Refer to the output given. Compare the sample medians. What do they tell us about the research question?

b. Refer to the output to perform a Mann-Whitney test using a significance level of 0.05. State all four steps of a significance test.

Chapter 13, Problem 23SE, Meat-Eating Behavior (Example 4) A researcher was interested in the ethics of eating meat, so he

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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Chapter 13, Problem 22SE

Chapter 13, Problem 24SE

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Chapter 13 Solutions

Introductory Statistics

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Solution Summary: The author compares the sample medians and concludes that the median number of meals taken by the professors of the ethics group is less than the average number. They state the steps to test the hypotheses using the Mann-Whit

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