Essay
The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour.
a.Compute the standard error of the mean.
b.Determine a 99% confidence interval estimate for the speed of all cars.
Correct Answer:
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a. 
= 1
b....View Answer
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Correct Answer:
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= 1b....
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