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1) To assess the precision of a laboratory scale, we measure a block known to have a mass of 1 gram. We measure the block

1) To assess the precision of a laboratory scale, we measure a block known to have a mass of 1 gram. We measure the block n times and record the mean x of the measurements. Suppose the scale readings are normally distributed with unknown mean and standard deviation = 0.001 g. How large should n be so that a 95% confidence interval for has a margin of error of 0.0001?

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