Abstract
Process capability is reflected on four major factors such as materials, equipments. skill of operators, and methods. The status of the process is typically represented by the mean value 〔$\mu$〕as a central tendancy, and the variance 〔$\sigma$$^2$〕 as a magnitude of dispersion. This paper analyzes the process capability by the experiment of chips is accounted on a population from the process. So, this paper analyzes the next four cases : (1) When the process distribution is changed from N[$\mu$$_1$, $\sigma$$^2$〕to N〔$\mu$$_2$, $\sigma$$^2$〕. (2) When the process distribution is changed from N[$\mu$, $\sigma$$_1$$^2$] to N[$\mu$, $\sigma$$_2$$^2$]. (3) When the population is compounded by the different two distributions of N〔$\mu$$_1$, $\sigma$$^2$〕and N〔$\mu$$_2$, $\sigma$$^2$〕. (4) When the population is compounded by the different two distributions of N〔$\mu$, $\sigma$$_1$$^2$〕 and N[$\mu$$\sigma$$_2$$^2$].