Table 2. Pairwise comparisons with a −5 dB signal-to-noise ratio.
| Source | Degrees of freedom | Sum of squares | Mean square | F value | Pr >F |
|---|---|---|---|---|---|
| Model | 17 | 2169.663376 | 127.627257 | 4.75 | <0.0001 |
| Error | 42 | 1128.181188 | 26.861457 | ||
| Corrected total | 59 | 3297.844564 | |||
| Source | Degrees of freedom | Type III SS | Mean square | F value | Pr >F |
| Muff type | 3 | 1043.899574 | 347.966525 | 12.95 | <0.0001 |
| Difference | Estimate | Standard error | P value | 95% Confidence Interval of Difference | |
| Passive vs Elec OFF | 5.075* | 1.8925 | 0.010 | (1.256, 8.894) | |
| Passive vs Elec LOW | 3.854* | 1.8925 | 0.0480 | (0.035, 7.674) | |
| Passive vs Elec HIGH | 11.583* | 1.8925 | <0.0001 | (7.764, 15.403) | |
| Elec OFF vs Elec LOW | -1.221 | 1.8925 | 0.5224 | (−5.040, 2.598) | |
| Elec OFF vs Elec HIGH | 6.508* | 1.8925 | 0.0013 | (2.689, 10.327) | |
| Elec LOW vs Elec HIGH | 7.729* | 1.8925 | 0.0002 | (3.910, 11.548) | |
*
As judged in an LSD test (DF=42, least significance difference=3.8192), the means differ significantly at the α=0.05 level.