A manufacturer of steel wants to test effect of method of manufacture on the tensile strength of the specific type of steel. Four different techniques have been tested and data shown in Table 1. Test the significance of the effect at α = 0.05
Table 1
Methods Tensile Strength
| 1 |
2650 |
2765 |
2750 |
2600 |
| 2 |
2985 |
2975 |
2865 |
2890 |
| 3 |
2775 |
2620 |
2690 |
2700 |
| 4 |
2900 |
2885 |
2850 |
2950 |