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Result from one-way ANOVA: effect of waste fiber/filler (palm fiber, coffee husk, none) on 3D Hybrid glass–jute composite (3DJGC) at 1000 Hz and 10,000 Hz.
| Frequency (Hz) | Waste Fiber Type | Mean dB Difference | F-Value | p-Value |
|---|---|---|---|---|
| 1000 Hz | Palm fiber | 7.5 | 15.8 | 0.01 |
| 1000 Hz | Coffee husk | 7.2 | 14.6 | 0.01 |
| 1000 Hz | None | 4.7 | 10.5 | 0.02 |
| 10,000 Hz | Palm fiber | 35.9 | 45.7 | 0.001 |
| 10,000 Hz | Coffee husk | 34.6 | 42.8 | 0.001 |
| 10,000 Hz | None | 25.4 | 32.5 | 0.01 |
