February 13
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February 13
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10.14 pg 637<br />
To assess the accuracy of a laboratory scale, a standard<br />
weight known to weigh 10 grams is weighed repeatedly.<br />
The scale readings are Normally distributed with unknown<br />
mean (the mean is 10 g if the scale has no bias). The<br />
standard deviation of the scale readings is known to be<br />
0.0002 gram.<br />
b) How many measurements must be averaged together<br />
to get a margin of error of ± 0.0001 with 98% confidence?<br />
9
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