Implementation of Statistic Quality Control (x bar-R chart) for Critical Trait of Kerosine Product in PPSDM Cepu

Abstract

This study aims to determine the implementation of statistical quality control (Graph of Control x bar -R) for the main properties of Kerosine products in PPSDM Cepu. The control graph xbar-R is the control chart used if the sample taken is small n> 10. To find out the quality of the main properties of the kerosine in the Cepu PPSDM can use SPSS aids using the X pen-R control chart. Observation parameters are the acquisition of distillation in 200oC and Final Boiling Point (FBP). Normality of Observation Data in the Parameter of Distillation Obtaining During 200^oC and Final Boiling Point was analyzed using the analysis of the Kolmogorov-Smirnov test with a significant level of 5%, if the data is normally distributed followed by a test in the R. diagram if the diagram R is under control used. If the R diagram is in uncontrolled condition, then the data must be improved in advance so that it is in a controlled condition. In making the control graph using SPSS, it was found that the acquisition of distillation during 200^oC and the final boiling point on the kerosine product was in a controlled state because all points were within the control limit of 3?. This means that Kerosine products have good quality.