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Confidence interval for the mean speed

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There is concern about the speed of automobiles traveling over a particular stretch of highway. For a random sample of 28 automobiles, radar indicated the following speeds, in miles per hour:

59   63   68   57   56   71   59

69   53   58   60   66   51   59

54   64   58   57   66   61   65

70   63   65   57   56   61   59

Assuming a normal population distribution, find the margin of error of a 95% confidence interval for the mean speed of all automobiles traveling over this stretch of highway.

Reference no: EM131493846

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