Question
There is concern about the speed of automobiles traveling over US 131. For a random sample...
There is concern about the speed of automobiles traveling over US 131. For a random sample of seven automobiles radar indicated the following speeds, in miles per hour:80, 74, 69, 78, 87, 72, and 70. 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.
( mean= 75.7143, S=6.3957)
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