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A researcher conducts a study of perceptual illusions under two different lighting conditions. ...

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A researcher conducts a study of perceptual illusions under two different lighting conditions. ...

A researcher conducts a study of perceptual illusions under two different lighting conditions. Twenty participants were each tested under both of the two different conditions. The experimenter reported: “The mean number of effective illusions was 6.72 under the bright conditions and 6.85 under the dimly lit conditions, a difference that was not significant, t(19) = 1.62.”

Explain this result to a person who has never had a course in statistics. Be sure to use sketches of the distributions in your answer.

Source Aron,A., coups, E.J.,N. (2011). Statistics for the Behavioral & Social Sciences: A Brief Course )5th ed). Boston, MA: Prentice Hall.

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