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A car has a gas mileage listing of 28 miles per gallon. You take the car...

A car has a gas mileage listing of 28 miles per gallon. You take the car out on 56 trips and find the average gas mileage to be 25 with a standard deviation of 6 mpg.

a) At the .01 level is the car getting gas mileage less than expected? (p = 0)

b) True or false: natural variability is the reason for the change in gas mileage

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