Step 1: Define the Model
The first order response surface model for three factors (X1, X2, X3) can be expressed as:
\[ Y = \beta_0 + \beta_1X_1 + \beta_2X_2 + \beta_3X_3 + \epsilon \]
where \( Y \) is the response variable, \( \beta_0, \beta_1, \beta_2, \beta_3 \)
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