12. A production manager is concerned with the average weight of metal ingots. From past data, he knows that population standard deviation is 1.6 lbs. The manager wishes to make a 95% interval estimate using a sample of 64 ingots. What will be the maximum sampling error (E) in estimating the population mean with this sample? a. 0.2 b. 0.4 E = 1.960 (1.6 / 8) 8: Square root of 64 c. 0.25 OR d. 1.6 Condence (.05, 1.6, 64) +-1.96*(16/ square root 64):.39 e. 0.05