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Linear Modelingmedium
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In a simple linear regression y^=β0+β1x\hat{y} = \beta_0 + \beta_1 xy^​=β0​+β1​x, what is the value of ∑i=1n(yi−y^i)xi\sum_{i=1}^{n} (y_i - \hat{y}_i)x_i∑i=1n​(yi​−y^​i​)xi​?