By measuring the amount of time it takes component of product to move from one workstation to the next, an engineer has estimated that the standard deviation is 4.42 seconds.
Answer each of following (show all work):
(A) How many measurements must be made in order to be 90% certain that the maximum error of estimation will not exceed 1.5 seconds?
(B) What sample size is needed for a maximum error of 1.0 seconds?