Question: 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

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. Three weighings of a specimen on this scale give 3.412, 3.416, and 3.414 grams.

Question: A 95% confidence interval for the true weight of this specimen is: A. 3.414 -+ 0.00113, B. 3.414 -+ 0.00065, or C. 3.414 -+ 0.00196

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