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    Student t test

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    A psychologist 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 example.

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    Solution Summary

    The solution provides step by step method for the calculation of test statistic. Formula for the calculation and Interpretations of the results are also included.