6 Twelve specimens of cold-reduced sheet steel, having different copper contents and annealing temperatures, are measured...

 

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6 Twelve specimens of cold-reduced sheet steel, having different copper contents and annealing temperatures, are measured for hardness with the fol- lowing results: Copper Annealing Hardness content temperature (Rockwell 30-T) (%) (degrees F) 78.9 0.02 1,000 65.1 0.02 1,100 55.2 0.02 1,200 56.4 0.02 1,300 80.9 0.10 1,000 69.7 0.10 1,100 57.4 0.10 1,200 55.4 0.10 1,300 85.3 0.18 1,000 71.8 0.18 1,100 60.7 0.18 1,200 58.9 0.18 1,300 Fit an equation of the form y = Bo + B1 x1 + B2 x2, where x1 represents the copper content, x2 repre- sents the annealing temperature, and y represents the hardness. 6 Twelve specimens of cold-reduced sheet steel, having different copper contents and annealing temperatures, are measured for hardness with the fol- lowing results: Copper Annealing Hardness content temperature (Rockwell 30-T) (%) (degrees F) 78.9 0.02 1,000 65.1 0.02 1,100 55.2 0.02 1,200 56.4 0.02 1,300 80.9 0.10 1,000 69.7 0.10 1,100 57.4 0.10 1,200 55.4 0.10 1,300 85.3 0.18 1,000 71.8 0.18 1,100 60.7 0.18 1,200 58.9 0.18 1,300 Fit an equation of the form y = Bo + B1 x1 + B2 x2, where x1 represents the copper content, x2 repre- sents the annealing temperature, and y represents the hardness.

Answer rating: 100% (QA)

Solution The multivariate regression model is y 0 1 x1 2 x2 Where y represents the hardness x1 repre... View the full answer