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    Driving habits of individuals-Confidence interval for speed

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    The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars travelling on the highway revealed an average speed of 67 miles per hour with a sample standard deviation of 9 miles per hour.

    Construct a 99% confidence interval estimate for the speed of all cars.

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    https://brainmass.com/statistics/confidence-interval/driving-habits-individuals-confidence-interval-speed-459336

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    See the attached file.

    "The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars travelling on the highway revealed an average speed of 67 miles per hour with a sample standard deviation of 9 miles per hour.
    Construct a ...

    Solution Summary

    The solution shows step-by-step how to estimate the confidence interval.

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