Figure 5
The first graph is a probability plot for the original data. The x-axis ranges from -10 to 30, and the y-axis measures percent from 0.1 to 99.9. The data points deviate from the normal distribution line, indicating that the data is not normally distributed. The second graph is a scatter plot with the x-axis labeled Z Value ranging from 0.3 to 1.2 and the y-axis labeled P-Value for AD test ranging from 0.00 to 0.10. The data points are scattered, showing that no transformation managed to fit the data into a normal distribution. The text annotation states that no transformation with a P-Value greater than 0.1 was selected, and no transformation is made.Johnson's transformation for the total service time before improvement. Source: Authors' own creation