## 5 Time-Series Analysis of Application Results of ICT-Based Education Program
### Analysis of Satisfaction Regarding the Yearly Averages of Education Participants
Differences between the means of satisfaction across the years were statistically significant (\(p<0.001\)), with the mean of satisfaction level in 2017 significantly higher than those of 2018 and 2019. The analysis results of the means of satisfaction level of faculty members across five years from 2017 are shown in detail in Table 8. Figure 5 shows the data in a box-and-whisker plot with a trend line added, and this trend line is smoother than that featured in Figure 4. Furthermore, except for 2020 and 2021, the data is distributed between 4 and 5 points. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **No. of Cases** & **Mean** & **Standard Deviation** & **Welch F** & \(p\) & **Post-Hoc** (Games–Howell)** \\ \hline
2017 (a) & 522 & 4.54 & 0.60 & & & \\
2018 (b) & 284 & 4.14 & 0.78 & & & a \textgreater{} b,c,d,e \\
2019 (c) & 505 & 3.30 & 0.80 & 89.304 *** & 0.000 & b \textgreater{} c,d \\
2020 (d) & 769 & 4.32 & 0.71 & & & d \textgreater{} c,e \\
2021 (e) & 491 & 4.10 & 0.82 & & & e \textgreater{} c \\ \hline \hline \end{tabular}
\end{table} 
Table 7: 2017–2021 means elementary/secondary students satisfaction level. Figure 4: Box-and-whisker plot of the satisfaction of elementary/secondary students by year. Speaking of the mean of satisfaction level of school administrators with the education programs across the five years, the satisfaction level in 2017 was the highest, as is the case with the satisfaction levels of elementary/secondary students and faculty members (Mean = 4.86). By a slight margin, the mean of satisfaction level in 2018 was 4.84, followed by 2021, 2020, and 2019. The satisfaction level results of school administrators with the education programs across the years was statistically significant (\(p<0.001\)). In the post-hoc test, the means of satisfaction level in 2017 and 2018 were significantly higher than those of 2017 and 2018, whereas the means of satisfaction level in 2020 and 2021 were more significant than that of 2019, a year which features more significant results than the means of satisfaction in all the other years for the past five years, excluding 2019. Results of detailed analysis of the means of satisfaction level of school administrators across the five years are shown in Table 9. The visualization chart in Figure 6 shows a flat trend, excluding 2019 which is the only year when the mean dropped to the 3-point range. 2019 also shows somewhat wider data distribution than the other years. Figure 5: Box-and-whisker plot of the satisfaction of faculty members by year. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **No. of Cases** & **Mean** & **Standard Deviation** & **Welch F** & \(p\) & **Post-Hoc (Games–Howell)** \\ \hline
2017 (a) & 293 & 4.82 & 0.18 & & \\
2018 (b) & 438 & 4.72 & 0.30 & & \\
2019 (c) & 855 & 4.54 & 0.33 & 9.097 *** & 0.000 & a \textgreater{} b,c \\
2020 (d) & 339 & 4.72 & 0.35 & & \\
2021 (e) & 71 & 4.61 & 0.57 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 8: 2017–2021 means of faculty members’ satisfaction level. When the means of satisfaction level of the general public with the education programs across the five years from 2017 to 2021 were analyzed, the mean of satisfaction level in 2017 was the highest at 4.69 as is the case with all the other participant groups. Then, the mean in 2019 showed the second-highest satisfaction level at 4.64, which was followed by 2018, 2020 and 2021. The means of satisfaction of the general public analyzed per year for five years from 2017 showed statistically significant results (\(p<0.001\)). Meanwhile, the post-hoc test showed that the high satisfaction level in 2017 was statistically significantly higher than the means of satisfaction in 2018, 2020, and 2021. Furthermore, the mean of satisfaction level in 2019 showed statistically more significant results than those of 2018 and 2021. Table 10 shows the analysis results of the means of satisfaction level of the general public across the five years, whereas Figure 7 presents a visualized chart of such analysis results.