Assuming normal population distribution

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There is concern about the speed of automobiles travelling over a particular stretch of highway. For a random sample of seven automobiles radar indicted the following speeds, in miles per hour: 79, 73, 68, 77, 86, 71, 69 Assuming a normal population distribution, find the margin error of a 95% confidence interval for the mean speed of all automobiles traveling over this stretch of highway.

Reference no: EM131113824

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