One of the commonly used performance measures in the Taguchi method is Where s2 is the sample

Question:

One of the commonly used performance measures in the Taguchi method is

Where s2 is the sample variance. In general, the higher the performance measure, the better the design. This measure is called robustness statistics. For the problem of Exercise 9.5.1, suppose that we run the experiment by controlling various factors affecting the thickness. Table 9.5.1 shows the data obtained in four different runs.
In Table 9.5.1