Suppose that you work for a local real estate company and are given the task of investigating your company's seasonal sales patterns over the past ten years. Comparing average sales to your firm's typical Fall performance over this 10-year period, you discover that winter sales are typically 10 units fewer than the fall, spring sales are three units higher than the fall, and summer sales are typically 20 units greater than the fall. Use this information to determine appropriate seasonal adjustment values (relative to the fall), and seasonally adjust the 2013 sales figures. Which season had the best seasonally adjusted sales performance in 2013?

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2013 Raw Seasonal Adjustments Seasonally Adjusted 2013 Sales Sales 25 Fall Winter 25 11 18 Spring Summer 40