Over the past 30 years, public awareness and concern about air pollution have escalated dramatically. Venturi scrubbers are used for the removal of submicron particulate matter from smoke stacks. An experiment was conducted to determine the effect of air flow rate, water flow rate (liters/minute), recirculating water flow rate (liters/minute), and orifice size (mm) in the air side of the pneumatic nozzle on the performance of the scrubber, as measured by the number of transfer units. The results are stored in Scrubber.
Develop the most appropriate multiple regression model to predict the number of transfer units. Be sure to perform a thorough residual analysis. In addition, provide a detailed explanation of your results.