Prices of crude oil have been steadily rising over the last two years (The Wall Street Journal,December 14,2010) .The monthly data on price per gallon of unleaded regular gasoline in the United States from January 2009 to December 2010 were available.Three trend models were created,and the following relevant information became available. 
Which of the following would be a difference in the forecasts for the price of regular unleaded gasoline for February 2011 comparing two trend models: cubic and quadratic?
Definitions:
Net Present Value
A valuation method used to determine the attractiveness of an investment opportunity, calculating the difference between the present value of cash inflows and the present value of cash outflows over a period of time.
Profitability Index
A financial metric used to evaluate the desirability of an investment or project, calculated as the present value of future cash flows divided by the initial investment cost.
Discounted Payback
is a capital budgeting method that calculates the period of time required for the discounted cash flows from a project to recoup its initial cost.
Wholesale Book Outlet
A distributor that sells books in large quantities at discounted prices, primarily to retailers, libraries, and educational institutions.
Q37: When conducting a hypothesis test for the
Q54: For the model y = β<sub>0 </sub>+
Q59: After we have estimated the trend and
Q76: In the model y = β<sub>0</sub> +
Q78: Which of the following is a criticism
Q86: The following Excel scatterplot with the fitted
Q87: Which of the following models is considered
Q88: Based on quarterly data collected over the
Q113: It is believed that the sales volume
Q120: If the model y<sub>t</sub> = T<sub>t</sub> ×