4th Edition

ISBN: 9780321826275

Author: Richard D. De Veaux

Publisher: PEARSON

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Chapter 11, Problem 20E

Honesty Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many people cheat. Researchers at Newcastle University replaced the picture of flowers on the wall behind the coffee station with a picture of staring eyes. They found that the average contribution increased significantly above the well-established standard when people felt they were being watched, even though the eyes were patently not real. (The New York Times 12/10/06)

a) Was this a survey, an observational study, or an experiment? How can we tell?
b) Identify the variables.
c) What does “increased significantly” mean in a statistical sense?

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Chapter 11, Problem 19E

Chapter 11, Problem 21E

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Chapter 11 Solutions

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Solution Summary: The author explains that an experimental study is a survey or observational study or an experiment.

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