The Exposure Coefficient in the Regression $P = a + b \times S + e$

The exposure coefficient in the regression $P = a + b \times S + e$ is given by:

A) $b = \frac { \operatorname { Cov } ( P , S ) } { \operatorname { Var } ( S ) }$
B) $P = a + b \times S + e$
C) $b = \frac { \operatorname { Cov } ( P , S ) } { \operatorname { Var } ( P ) }$

Correct Answer:

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