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5. A laboratory scale is known to have a standard deviation of o = 0.001 gram in repeated weighings. Scale readings in repeated weighings are

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5. A laboratory scale is known to have a standard deviation of o = 0.001 gram in repeated weighings. Scale readings in repeated weighings are normally distributed, with mean equal to the true weight of the speci- men. Three weighings of a specimen give (in grams) 3.412,3.414,3.415 Give a 95% confidence interval for the true weight of the specimen

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