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Please Help solve the advanced Probability Question: We take a sample of size 12 to test our assumption that the mean weight of a mechanical

Please Help solve the advanced Probability Question:

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We take a sample of size 12 to test our assumption that the mean weight of a mechanical part is 15 kilogram. We do not have any idea about the variance. Our test will be based on Q the normal distribution whether or not we may assume that the underlying distnbution is normal. (:3: the normal distribution, provided we can assume normality. {j the t~distribution, provided we can assume normality. C} the t~distribution whether DI not WE lTIEi'yr EISSUIT'IE that the undertying diSIliDUtiDl'l i3 FIDI'ITIEI

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