Properly wash and sanitize hand are essential to stopping the spread of germs and diseases.A 2016 study evaluated the antimicrobial efficacy of four different name brand hand sanitizers: Sterillium, PureHands, Lifebuoy, Dettol. The researchers studied the antimicrobial efficacy for a number of different disease-causing bacteria. Let's focus on comparing the antimicrobial efficacy for the bacteria Escherichia coli, commonly known as E.coli. The antimicrobial efficacy was measured in millimeters (mm) by the "zones of inhibition which indicated the degree of susceptibility or resistance (in mm), the more effective the sanitizer, since it is preventing the spread of the bacteria. The following data were hypothetically generated based on the actual means and standard deviations from the original study. Part A: What is the factor of interest? Part B: How many levels or groups were compared? Part C: What is the response variable? Part D: Do the factor of interest and respond variable allow for reasonable use of an ANOVA? Explain.