Scatter Diagrams and High-Low Cost Estimation From April 1 through October 31, Will 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: Month Miles Mowed and Cleaned Labor Costs April 350 $8,000 May 300 7,500 June 400 9,000 July 250 5,500 August 375 8,500 September 200 5,000 October 100 4,800 Use the information from the high- and low-volume months to develop a cost-estimating equation for monthly labor costs. Monthly labor costs = Plot the data on a scatter diagram. Using the information from representative high- and low volume months, use the high-low method to develop a cost-estimating equation for monthly labor costs. Monthly labor costs = Adjust the equation developed in requirement (b) to incorporate the effect of an anticipated 7 percent increase in wages. Monthly labor costs =