Based on the data collected by the sales manager in the Copier case, it appears that she would have some difficulty predicting the sales based on only sales calls - especially at some levels of sales calls.For example, if one of her salespeople made between 70 and 80 calls, would she be able to predict a certain number of sales?Would it be easier to predict a range of sales?If yes, what would that range be?Hint: Review the PPT slides on correlation and regression for more information.