SOLUTION: I tried reading the text more than once and even tried the hints that were given but....thanks in advance By measuring the amount of time it takes a component of a product to move

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Question 663785: I tried reading the text more than once and even tried the hints that were given but....thanks in advance
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 3.15 seconds. Please answer the following and show all work: A) how many measurements should be made in order to be 99% certain that the maximum error of estimation will not exceed 1.0 seconds? B) what sample size is required for a maximum error of 2.0 seconds?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
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 3.15 seconds. Please answer the following and show all work:
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A) how many measurements should be made in order to be 99% certain that the maximum error of estimation will not exceed 1.0 seconds? ------
n = [z*s/E]^2
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n = [2.5758*3.15/1.0]^2 = 66 when rounded up
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B) what sample size is required for a maximum error of 2.0 seconds?
n = [2/5758*3.15/2]^2 = 17 when rounded up
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Cheers,
Stan H.