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assume that the heights of bookcases are normally distributed. a random sample of 16 bookcases in one company have a mean height of 67.5 inches

assume that the heights of bookcases are normally distributed. a random sample of 16 bookcases in one company have a mean height of 67.5 inches and a standard deviation of 3.1 inches. construct a 99% confidence interval for the population standard deviation

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