a county is considering raising the speed limit on a road because they claim that the mean

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a county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is great than 30 miles per hour. A random sample of 20 vehicles has a mean speed of 33 miles per hour and a standard deviation of 4.5 miles per hour. At a=.01, do you have enough evidence to support the county's claim?

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