Table 7.
Z-test for difference in mean length of the primary rugae of the two ethnic groups.
| Variable | Sample size (N) | Min | Max | Mean | SD | z (calculated value) | |z| (critical value) | P value (calculated) | Inference |
|---|---|---|---|---|---|---|---|---|---|
| Male Igbo >5 MM | 273 | 5.01 | 18.48 | 10.18 | 2.99 | 2.535 | 1.96 | 0.011 | Significant ∗ |
| Male Ikwerre >5 MM | 312 | 5.01 | 19.12 | 9.54 | 3.11 | ||||
|
| |||||||||
| Female Igbo >5 MM | 264 | 5.01 | 18.5 | 10.03 | 3.18 | 1.406 | 1.96 | 0.16 | Not significant |
| Female Ikwerre >5 MM | 285 | 5.01 | 17.21 | 9.66 | 2.96 | ||||
The asterisks were used to demonstrate values with significant difference.