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In order to find the average speed of cars on Interstate 95, researchers set up...

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In order to find the average speed of cars on Interstate 95, researchers set up an observational study on the side of the road. Researchers gathered a sample of 10 cars and found their average speed. They did this 100 times in order to create a sampling distribution. The range of speeds on the sampling distribution was 45 to 95 with a mean of 67. What was the margin of error?67 miles per hour25 miles per hour14 miles per hour70 miles per hour

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