- bl es i Data Table w ovl Number of Lab Tests Performed Total Laboratory Overhead Costs Month 3,000 $21,900 January February 2,850 $20,600 $28,900 $31,000 3,400 3,700 3,900 March. April May $28,000 1,900 June. $20,200 $14,000 July 2,050 The manager of the man laboratory facility at MetroHealth Center is interested in being able to predict the overhead costs each month for the lab. The manager believes that total overhead varies with the number of lab tests performed but that some costs remain the same each month regardless of the number of lab tests performed The lab manager collected the following data for the first seven months of the year (Click the icon to view the data) Use the high low method to determine the laboratory's cost equation for total laboratory overhead Use your results to predict total laboratory overhead t 2,800 in tests are performed next month Let's begin by determining the formula that is used to calculate the variable cost (slope) = Variable cost (slope)