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Solution) The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars

Question: 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.

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Solution) The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars

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