What does increased significantly mean in statistical sense

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Reference no: EM131646988

Question: 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. (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?

Reference no: EM131646988

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