To determine a mathematical equation, one would need to first identify the variables involved and then use algebra to solve for the unknown variable.
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Using the means found in Figure 1, the regression line for Example 1 is (Price – 47.18) = 4.90 (Color – 6.00) + 3.76 (Quality – 4.27) or equivalently Price = 4.90 ∙ Color + 3.76 ∙ Quality + 1.75 Thus, the coefficients are b0 = 1.75