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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

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