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Professor Jones Gives a Quiz in Her Statistics Course and Obtains

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Professor Jones gives a quiz in her statistics course and obtains the following 20 scores:
Professor Jones gives a quiz in her statistics course and obtains the following 20 scores:     Calculate the variance and standard deviation by  (a) the deviation-score method, and (b) the raw-score method.
Calculate the variance and standard deviation by
(a) the deviation-score method, and
(b) the raw-score method.

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