Problem 18-28 (Algo) The following are historical demand data: ACTUAL DEMAND YEAR SEASON Spring Summer 2011 201 148 Fall Winter 378 562 Spring Summer Fall Winter 2012 473 269 678 958 Use regression analysis on deseasonalized demand to forecast demand in summer 2013. (Do not round intermediate calculations. Round your answer to the nearest whole number.) Forecast for summer 2013

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