Figure 4
The x-axis represents total service time ranging from -10 to 30, and the y-axis represents the percent ranging from 0.1 to 99.9. The mean is 11.06, the standard deviation is 5.547, and the sample size is 200. The Anderson-Darling statistic is 4.277, and the p-value is less than 0.005. The data points are plotted along the curve, with confidence interval lines indicating the 95% confidence interval. All values are approximated.Probability plot of total service time before improvement. Source: Authors' own creation