## 3 Results and Discussion  
Verification That the Selection of Measured Values Comes from a Population with a Normal Distribution  
In this part, it was necessary to verify the hypothesis of a normal population distribution. The hypothesis of a normal population distribution (Table 5) was not rejected, i.e., the measurements were performed correctly, and the results of measurements can be further used for statistical evaluation using parametric tests.  
Tables 5 and 6 present the results for groups of measurements without outliers. This section may be divided by subheadings. It should provide a concise and precise description of the experimental results, their interpretation, as well as the experimental conclusions that can be drawn.  
Figure 12: Size of deformation in the direction of axis \(Z\) for CvM_NcM, determined by FEM calculation, under self-weight loading.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Measurement** & **Shapiro-Wilk Statistics** & **Normal Distribution Result** \\ \hline Add\_CoM\_0\_Xx & W = 0.8942, \(p\)-value = 0.1568 & not reject \\ Add\_CoM\_0\_Yy & W = 0.92155, \(p\)-value = 0.3317 & not reject \\ Add\_CoM\_0\_Zz & W = 0.94601, \(p\)-value = 0.5935 & not reject \\ Add\_CoM\_1\_Xx & W = 0.9363, \(p\)-value = 0.478 & not reject \\ Add\_CoM\_1\_Yy & W = 0.95938, \(p\)-value = 0.7639 & not reject \\ Add\_CoM\_1\_Zz & W = 0.88907, \(p\)-value = 0.1354 & not reject \\ Add\_CoM\_2\_Xx & W = 0.86257, \(p\)-value = 0.06217 & not reject \\ Add\_CoM\_2\_Yy & W = 0.90804, \(p\)-value = 0.2312 & not reject \\ Add\_CoM\_2\_Zz & W = 0.91918, \(p\)-value = 0.3119 & not reject \\ CvM\_CoM\_0\_Xx & W = 0.87682, \(p\)-value = 0.0948 & not reject \\ CvM\_CoM\_0\_Yy & W = 0.96168, \(p\)-value = 0.7925 & not reject \\ CvM\_CoM\_0\_Zz & W = 0.92054, \(p\)-value = 0.3232 & not reject \\ CvM\_CoM\_1\_Xx & W = 0.87293, \(p\)-value = 0.08454 & not reject \\ CvM\_CoM\_1\_Yy & W = 0.93015, \(p\)-value = 0.4123 & not reject \\ CvM\_CoM\_1\_Zz & W = 0.92542, \(p\)-value = 0.3664 & not reject \\ CvM\_CoM\_2\_Xx & W = 0.95298, \(p\)-value = 0.6823 & not reject \\ CvM\_CoM\_2\_Yy & W = 0.96823, \(p\)-value = 0.8682 & not reject \\ CvM\_CoM\_2\_Zz & W = 0.9256, \(p\)-value = 0.3681 & not reject \\ \hline \hline \end{tabular}
\end{table}
Table 5: CoM normality test.  
Since the comparison using non-parametric methods is not possible for the measurement results, a comparison for measurements in the direction of the Y axis was not performed for the aforementioned sets, they are pairs: CoM_0_Yy, CoM_1_Yy, CoM_2_Yy. Statistical conclusions show for practice that in the measurements in the Y-axis direction, there was a dimensional anomaly during the exchange of the arms, caused by non-compliance with assembly procedures and prescribed tightening torques of screws securing the arm.  
The hypothesis of a normal population distribution for all NCM measurements in Table 6 was not rejected, so the measurements were performed correctly, and the measurement results can be further used for statistical evaluation using parametric tests. When replacing the arms and ensuring the correct assembly procedures and the prescribed tightening torques of the screws, measurements were achieved that also met the statistical requirements.