A production manager is concerned with the average weight of metal ingots. From past data, she knows that ? is 1.6 lbs. The manager wishes to make a 95% interval estimate for ? using a sample of 64 ingots. The accuracy of this sample in estimating the population mean will be:
a. 0.20.
b. 0.392
c. 1.96.
d. 1.6.
e. ±0.05.
B
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