Ononot — Let zx and zy represent the standardized versions (z-scores)

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Linear Modelingmedium

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Let $z_x$ and $z_y$ represent the standardized versions (z-scores) of variables $x$ and $y$ . If the least-squares regression line for predicting $z_y$ from $z_x$ has slope $m_1$ , and the least-squares regression line for predicting $z_x$ from $z_y$ has slope $m_2$ , which of the following is true for any non-zero, non-perfect correlation?