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Suppose that a device advertised to increase a car’s gas mileage really does not increase gas...

Suppose that a device advertised to increase a car’s gas mileage really does not increase gas mileage in reality. We test it on a small fleet of cars (with ?0: does not increase gas mileage and ??: increases gas mileage), and our data results in a p-value of 0.08. Assuming we use ? = 0.10 to make our conclusion, did we make a type I error, type II error, or a correct decision?

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