As the Carbon Content in Steel Increases, Its Ductility Tends

Multiple Choice

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 ofsteel. Use the following regression results to find the 95% confidence interval for the
Slope of the regression equation. $$\begin{array} { l r r r r } \text { Predictor } & \text { Coef } & \text { SE Coef } & \text { T } & \text { P } \\\text { Constant } & 7.671 & 1.507 & 5.09 & 0.000 \\\text { Carbon Content } & - 3.296 & 1.097 & - 3.01 & 0.010\end{array}$$

A) -5.456 to -1.136
B) -4.393 to -2.199
C) 6.164 to 9.178
D) -5.666 to -0.926
E) 2.581 to 12.761