Statistical Process Control on Production: A Case Study of Some Basic Chemicals Used in Pure Water Production

Abstract

Statistics is the art of making decisions about a process or population based on an analysis of the information contained in a sample from that population. In any production process, regardless of how well designed or carefully maintained it is, a certain amount of inherent or natural variability will always exits, Such variability like background noise. When the variability is small, we usually consider this an acceptable level of process performance or the process is within the process control. A process that is operating in the presence of assignable causes is said to be out of control. A data set collected from randomly selected packaged water producers referred to as “Pure water producers” and subjected to laboratory test of the of the level of some basic chemicals used in the production of pure water, such as pH, conductivity (μS/cm; Lead (Pb); Aluminum (Al) and Chloride (Cl). The test shows that most of the chemicals used are out of process control. This is danger to health of the consumers.