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Honesty Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many peo-ple 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 con-tribution increased significantly above the well-established standard when people felt they were being watched, eventhough the eyes were patently not real. (NY Times 12/10/06)a) Was this a survey, an observational study, or anexperiment? How can we tell?b) Identify the variables.c) What does “increased significantly” mean in astatistical sense?

Honesty Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many peo-ple 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 con-tribution increased significantly above the well-established standard when people felt they were being watched, eventhough the eyes were patently not real. (NY Times 12/10/06)a) Was this a survey, an observational study, or anexperiment? How can we tell?b) Identify the variables.c) What does “increased significantly” mean in astatistical sense?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Honesty Coffee stations in offices often just ask users to
leave money in a tray to pay for their coffee, but many peo-
ple 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 con-
tribution increased significantly above the well-established
standard when people felt they were being watched, even
though the eyes were patently not real. (NY 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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