# 3D User Interface Design and Usability for Immersive VR
## 5 Results and Data Analysis
### Scenario Completion Time  
The scenario completion time refers to the total time taken to complete the test case scenario that is explained in Section 4. The scenario completion time was measured for each user interaction mode and for each experience. **Completion Time by Interaction Mode:** the time taken to complete the scenario by each participant for each user interaction mode can be seen in Table 4, with the minimum, maximum, and mean times at the bottom. In general, the maximum time ranges from 108 s (pointer-based) to 136 s (gesture-based). Similarly. The minimum time ranges from 34 s (pointer-based) to 47 s (gesture-based). This shows that the pointer-based interface is the preferable mode of interaction for the user even in a VR environment because of their familiarity with the interface. **Completion Time by Experience:** the time taken to complete the scenario by each participant for each user experience, standing and seated, can also be seen in Table 4. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Experience** & \multicolumn{2}{c}{**Standing**} & \multicolumn{2}{c}{**Seated**} \\ \hline
**Interface Type** & **Pointer** & **Controller** & **NUI** & **Pointer** & **Controller** & **NUI** \\ \hline Participant 1 & 59 & 92 & 81 & 57 & 76 & 136 \\ Participant 2 & 86 & 79 & 81 & 50 & 70 & 99 \\ Participant 3 & 42 & 43 & 51 & 35 & 54 & 47 \\ Participant 4 & 44 & 36 & 52 & 50 & 67 & 53 \\ Participant 5 & 50 & 41 & 75 & 41 & 56 & 59 \\ Participant 6 & 42 & 108 & 86 & 48 & 53 & 95 \\ Participant 7 & 52 & 56 & 72 & 42 & 65 & 61 \\ Participant 8 & 50 & 49 & 81 & 45 & 70 & 69 \\ Participant 9 & 65 & 58 & 95 & 64 & 88 & 104 \\ Participant 10 & 40 & 109 & 54 & 39 & 61 & 69 \\ Participant 11 & 108 & 95 & 102 & 108 & 110 & 135 \\ Participant 12 & 57 & 85 & 131 & 61 & 77 & 87 \\ Participant 13 & 76 & 55 & 127 & 44 & 70 & 65 \\ Participant 14 & 89 & 58 & 66 & 34 & 82 & 68 \\ Participant 15 & 107 & 74 & 109 & 85 & 68 & 100 \\ Participant 16 & 52 & 75 & 108 & 50 & 61 & 80 \\ Participant 17 & 44 & 79 & 80 & 92 & 57 & 69 \\ Participant 18 & 43 & 115 & 101 & 56 & 79 & 87 \\ Participant 19 & 51 & 64 & 92 & 57 & 88 & 64 \\ Participant 20 & 49 & 99 & 71 & 69 & 95 & 79 \\ Participant 21 & 42 & 90 & 71 & 53 & 57 & 57 \\ \hline Maximum & 108 & 115 & 131 & 108 & 110 & 136 \\ Minimum & 40 & 36 & 51 & 34 & 53 & 47 \\ Mean & 59.43 & 74.29 & 85.05 & 56.19 & 71.6 & 80.4 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Scenario completion time for each interface. Figure 15: Participant during the testing in the seating position. As can be seen in Table 4, the overall maximum time ranges from 131 s (standing) to 136 s (seated). Similarly, the minimum time ranges from 34 s (seated) to 36 s (standing). The mean time for completing the tasks in standing experience is 72.92 s and in seated experience is 69.32 s. This shows that the difference between their individual means and grand mean (68.12 s) is not significant enough regarding the results for completion time. The grand mean is the mean of sample means or the mean of all observations combined, irrespective of the sample. **Completion Time by Initial Interface:** the time taken to complete the scenario by a participant in each initial interface group can be seen in Table 5, with minimum, maximum, and mean times shown at the bottom. The maximum time ranges from 109 s (controller-based) to 101 s (gesture-based). Similarly, the minimum time ranges from 44 s (pointer-based) to 75 s (controller-based). This shows that the controller-based interface is the least preferable mode of interaction for the user. **Completion Time by Gender:** the time taken to complete the scenario by male and female participants for each user interaction mode and experience can be seen in Table 6. There were 10 male and 11 female participants.