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A laboratory scale is known to have a standard deviation of = 0.001 gram in repeated weighings. Scale readings in repeated weighings are normally distributed, with mean equal to the true weight of the specimen. How many times must you weigh a specimen on this scale in order to get a margin of error no larger than +0.0005 (+ has line underneath it) with 95% confidence interval?
A) 4 times
B) 15 times
C) 16 times
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