(Answered) There is concern about the speed of automobiles traveling

Finance

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.

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