Question: Speed Limit A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than

Speed Limit A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 45 miles per hour. A random sample of 25 vehicles has a mean speed of 48 miles per hour and a standard deviation of 5.4 miles per hour. At a = 0.10, do you have enough evidence to support the county's claim?

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