As the Carbon Content in Steel Increases, Its Ductility Tends $= 7.67 - 3.30$

As the carbon content in steel increases, its ductility tends to decrease. A researcher at a steel company measures carbon content and ductility for a sample of 15 types of
Steel. According to the output provided below, the standard error of the regression
Slope is The regression equation is
Ductility $= 7.67 - 3.30$ Carbon Content
$\begin{array} { l r r r r } \text { Predictor } & \text { Coef } & \text { SE Coef } & \text { T } & \text { P } \\ \text { Constant } & 7.671 & 1.507 & 5.09 & 0.000 \\ \text { Carbon Content } & - 3.296 & 1.097 & - 3.01 & 0.010 \end{array}$
$$S = 2.36317 \quad R - S q = 41.0 \% \quad R - S q ( a d j ) = 36.5 \%$$

A) -3.296
B) +2.363
C) +1.097
D) +1.507
E) +5.090