A series of experiments is conducted, and the coefficient of friction between a shaft and a

A series of experiments is conducted, and the coefficient of friction μ between a shaft and a bearing is computed. Tests are made using four different lubricants and three levels of machining of the bearings (highly polished, little polishing, no polishing). Using a 1% level of significance, determine whether or not the type of lubricant has an effect and whether or not the degree of machining has an effect on the coefficient of friction. The coefficients of friction are Lubricant Machining 1 2 3 4 High 0.0045 0.0058 0.0061 0.0048 Little 0.0051 0.0063 0.0064 0.0053 None 0.0068 0.0067 0.0073 0.0066