The following table shows the past two years of quarterly sales information. Assume that there are both

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The following table shows the past two years of quarterly sales information. Assume that there are both trend and seasonal factors and that the seasonal cycle is one year. Use regression and seasonal indexes to forecast quarterly sales for the next year.

Quarter Last Year Sales Quarter This Year Sales I

II III IV 215 240 205 190 I

II III IV 160 195 150 140 TW-111

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