To Assess the Accuracy of a Laboratory Scale,a Standard Weight

question 48

Multiple Choice

To assess the accuracy of a laboratory scale,a standard weight that is known to weigh exactly 1 gram is repeatedly weighed a total of n times and the mean is computed.Suppose the scale readings are Normally distributed with an unknown mean of  and a standard deviation of  = 0.01 grams.How large should n be so that a 95% confidence interval for  has a margin of error no larger than ± 0.0001?

• A)n = 100
• B)n = 196
• C)n = 10000
• D)n = 38416

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