The number of twists y required to break a certain rod is a function of the percentage

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The number of twists y required to break a certain rod is a function of the percentage x1 and x2 of each of two alloying elements present in the rod. The following table gives some pertinent data. Use linear multiple regression to obtain a model y = a0 + a1x1 + a2x2 of the relationship between the number of twists and the alloy percentages. In addition, find the maximum percent error in the predictions.

Number of twists Percentage of element 1 Percentage of element 2 y 40 1 51 1 65 1 72 1 38 2 46 2 53 2 67 2 31 3 39 3 48 3 56 3 1234t I23 4-23 4

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