Monthly sales data (in units) shows the following trend-adjusted ratios for three months: January (1.1), February (0.9), and March (1.0). What is the average seasonal index for this quarter?
1.0
The seasonal index is calculated by averaging the trend-adjusted ratios for the months in the quarter.
Average Seasonal Index = (1.1 + 0.9 + 1.0) / 3 = 3.0 / 3 = 1.0
Thus, the average seasonal index for this quarter is 1.0.
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