Select an answer from the options below and click Submit.
Question 1
Use the following residual plots to determine which regression curve fits the data best.
Answer: Correct! Go to question 2.
Answer: Incorrect. The answer is C. The quadratic regression residual plot shows the best uniform scattering of points about the horizontal axis. It also has the highest coefficient of determination. It is important to note that all three regression curves are weak fits, but a quadratic fit is best. Go to question 2.
Answer: Incorrect. Try again. Use the residual plot, the correlation coefficient and the coefficient of determination to form your conclusion.
Question 2
The pattern of the rise and fall of the price for a gallon of gas can be described generally by a quadratic regression curve.
Use a quadratic regression to approximate the maximum price for a gallon of gas over the past ten years. Round your answer to the nearest cent.
Answer: Correct!
Answer: Incorrect. The answer is B.
Answer: Incorrect. Try again. Be sure to use a quadratic regression, and round correctly.