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a school bus driver decides to record the times of each of the 8 red lights...

a school bus driver decides to record the times of each of the 8 red lights on his route. this sample of 8 traffic lights has a mean of X=21.5 seconds, with a population standard deviation is 3.9 seconds. Calculate the margin of error, E, for a 99% confidence level.
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Answer #1

Margine of error = 3.552

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