Hayden is a new driver who is trying to budget for gas prices. Although he is really tight on money, he has heard that higher octane fuel translates into higher gas mileage. So, he decides to conduct his own experiment to determine which fuel he should purchase. Given that he currently only drives between home, school, and his new job, Hayden can get by on one tank of gas per week in his Hyundai Kona. With this in mind, he plans to purchase fuel from his neighborhood RaceTrac each Friday for three weeks. He would begin with the lowest octane (87), then the mid-grade (89), and finally the highest octane level (91) in the third week. He will track his gas mileage with each fill-up and compare his mileage to determine which octane level provides the greatest value. Hayden has designed a very nice experiment, but we can't control everything in the real world. So, please answer the following questions: Name the independent variable (1 pt) Name the primary dependent variable (1 pt) Identify at least one extraneous variable (1 pt) Explain how the extraneous variable could/would affect the dependent variable (2 pts)