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 ??̅of the measurements. Suppose the scale readings are normally distributed with unknown mean μ and standard deviation σ= 0.001 g. How large should n be so that a 95% confidence interval for μ has a margin of error of ± 0.0001? A. 20 B. 385 C. 10,000 D. 66,358 E. 384

MATLAB: An Introduction with Applications
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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 ??̅of the measurements. Suppose the scale readings are normally distributed with unknown mean μ and standard deviation σ= 0.001 g. How large should n be so that a 95% confidence interval for μ has a margin of error of ± 0.0001?

A. 20

B. 385

C. 10,000

D. 66,358

E. 384

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