Figure 10
The histogram displays the distribution of total service time with a sample mean of 8.035 and a sample size of 200. The Lower Specification Limit (LSL) is 0, the Target is 8.035, and the Upper Specification Limit (USL) is 17. The standard deviation overall is 3.14375 and within is 2.94023. The overall capability indices are Pp 0.90, PPL 0.85, PPU 0.95, Ppk 0.85, and Cpm 0.85. The potential (Within) capability indices are Cp 0.96, CPL 0.91, CPU 1.02, and Cpk 0.91. The PPM data shows observed values of 0.00 for both PPM < LSL and PPM > USL, with expected overall values of 5296.27 and 2174.40 respectively. The total PPM observed is 0.00, with an expected overall value of 7470.67. The actual process spread is represented by 6 sigma. All values are approximated.Process capability of total service time after the improvements. Source: Authors' own creation