According to the graph belonging to K14 upper back measurement point in Fig. 4, sample average value (391.536mm) is quite higher than USL = 391 mm. Measuring values (mostly) are out of control limits by shifting. The probability of the fact that the measures exceed USL is 72.06%. The standard deviation is 0.93. Since the average value is greater than USL, CPU and Cpk values are negative.