How do drivers react to sudden large increases in the price of gasoline? To help answer the question, a statistician recorded the speeds of cars as they passed a large service station. He recorded the speeds (mph) in the same location after the service station sign showed that the price of gasoline had raised by 15 cents. Can we conclude that the speedsdiffer?

Speeds Before Price Increase 43 36 31 30 28 36 27 36 35 30 32 36 Speeds After Price Increase 32 33 36 31 32 29 28 39 2630 32 30