Question: Gamma Sales Corp. is trying to improve the sales forecasting ability of its five sales regions. The data in the worksheet for Prob. 14-10 represent the difference between actual sales and forecasted sales in millions of dollars. Construct \[\overline{\text{x}}\] - and R charts for the data in the worksheet Prob.14-10. What conclusions do you reach, if positive variances are considered good and negative variances are looked on as opportunities for improvement?