Scatter Diagrams and High-Low Cost Estimation Assume the local Pearle Vision has the following information on the number of sales orders received and order-processing costs. Required (a.) Use information from the high- and low-volume months to develop a cost-estimating equation for monthly order-processing costs. $+$X (b.) Plot the data on a scatter diagram. Using the information from representative high-and low-volume months, develop a cost estimating equation for monthly order-processing costs. $x+$xX