An appliance repair shop owner has fitted the quadratic trend equation y = 90 + 0.9x + 3x2 to a time series of annual repair orders, with y = the number of repair orders and x = 1 for 2000. Forecast the number of repair orders for 2008; for 2010.© BrainMass Inc. brainmass.com December 20, 2018, 2:28 am ad1c9bdddf
For 2008, x = 9, substitute x = 9 in the trend equation.
y = 90 + ...
A step by step solution is provided to problem on finding the number of repair orders for 2008 and 2010.