Question: A gasoline company has developed a new additive for gasoline that is supposed to improve the gas mileage of a car. A consumer organization has been asked to determine if the additive is effective. They have 10 professional drivers and 10 six- passenger cars of the same make and model and 10 four- passenger cars of the same make and model.

1. Design an experiment to test the effectiveness of the additive on both the six-passenger cars and the four-passenger cars.
2. Explain what type of hypothesis test you would use to test the effectiveness of the additive. Write both the null and alternate hypotheses. Define any variables used.

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