Scatter Diagrams and High-Low Cost Estimation (L02, 3) From April I through October 31, Knox County Highway Department hires temporary employees to mow and clean the right-of-way along county roads. The County Road Commissioner has asked you to help her in determining the variable labor cost of mowing and cleaning a mile of road. The following information is available regarding current-year operations: Required Use the information from the high- and low-volume months to develop a cost-estimating equation for monthly labor costs