Question: By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated

By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 5 seconds.
a. How many measurements should be made to be 95% certain that the maximum error of estimation will not exceed 1 second?
b. What sample size is required for a maximum error of 2 seconds?

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