Table 2 Value of mean and standard deviation of the measurements and description of the chi-square test for the T1 and T2 of different glass panes
From: Evidential significance of multiple fracture patterns on the glass in forensic ballistics
Thickness Of Glass | Hole diameter | Thickness of mist zone | Diameter of mist zone | Radial fracture count | Concentric fracture count | |||||
T1 | T2 | T1 | T2 | T1 | T2 | T1 | T2 | T1 | T2 | |
Mean values (in mm) | ||||||||||
 3 mm (transparent) | 5.76 | 1.73 | 12.09 | 4.45 | 28.57 | 9.422 | 11 | 3 | 7 | 2 |
 4 mm (transparent) | 6.08 | 5.70 | 12.64 | 12.40 | 31.54 | 28.78 | 9 | 8 | 7 | 9 |
 4 mm (privacy) | 5.74 | 5.95 | 13.79 | 11.40 | 33.17 | 28.90 | 8 | 7 | 5 | 5 |
 5 mm (transparent) | 5.61 | 5.42 | 9.35 | 13.51 | 23.66 | 32.11 | 9 | 8 | 5 | 4 |
Standard deviation | ||||||||||
 3 mm (transparent) | 0.37 | 2.77 | 1.01 | 6.69 | 2.33 | 14.04 | – | – | – | – |
 4 mm (transparent) | 0.29 | 0.43 | 0.78 | 1.07 | 1.43 | 3.62 | – | – | – | – |
 4 mm (privacy) | 0.61 | 0.46 | 1.55 | 2.13 | 2.44 | 4.33 | – | – | – | – |
 5 mm (transparent) | 0.49 | 0.60 | 2.95 | 4.23 | 6.77 | 9.008 | – | – | – | – |
Description of chi-square observations | ||||||||||
Null hypothesis H0: All the values are consistent, i.e., equals to the mean value. | ||||||||||
| Â | Calculated value of chi-square | Tabulate value of chi-square at 5% level of significance | ||||||||
T1 | T2 | |||||||||
 3 mm (transparent) | 0.576 | 69.022 | 13.848 | |||||||
 4 mm (transparent) | 0.347 | 1.99032 | ||||||||
 4 mm (privacy) | 1.560 | 1.19400 | ||||||||
 5 mm (transparent) | 1.032 | 1.619 | ||||||||