Table 4 Significance test of yield strength
From: Microstructural and mechanical studies of feedstock material in continuous extrusion process
Treatment combinations | Co-efficient | t-value | p-value |
|---|---|---|---|
Constant | 35.12 | 16.7 | 0.001 |
Wheel velocity (X1) | 0.9350 | 0.687 | 0.514 |
Product diameter (X2) | 1.4483 | 1.064 | 0.323 |
Wheel velocity × wheel velocity \( \left({X}_1^2\right) \) | −3.6547 | −3.710 | 0.008 |
Product diameter × product diameter \( \left({X}_2^2\right) \) | 8.0953 | 8.217 | 0.000 |
Wheel velocity × product diameter (X1X2) | 1.5700 | 0.666 | 0.527 |