Basic Statistics - Old Questions

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11. The mass of vitamin E in a capsule manufactured by a certain drug company is normally distributed with a standard deviation of 0.042 mg. A random sample of 36 capsules was analyzed, and the mean mass of vitamin E was found to be 5.12 mg. Calculate a symmetric 95% confidence interval for the population mean mass of vitamin E per capsule. [5]

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Asked in 2079

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