A Production Manager Is Concerned with the Average Weight of Metal

Multiple Choice

A production manager is concerned with the average weight of metal ingots.From past data,she knows that $\text { ? }$
is 1.6 lbs.The manager wishes to make a 95% interval estimate for $\mu$ 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) $\pm$ 0.05.