Computer Numerical Control (CNC) machine tools are used where the parts to be manufactured are complex; expensive jigs and fixtures are needed; frequent design changes are often necessary; etc. Purchase of CNC machine tools is generally influenced by need to reduce maintenance problems. Statistical parameters such as mean, standard deviation, Chi-square test, Hotelling's T2; test, analysis of variance (ANOVA), Duncan's multiple range test for multiple comparison and factor analysis, were used to analyse operating aspects of CNC machine tools.
