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.
Based on these data he obtained the following regression results. The 95% confidence interval for the slope of the regression equation is
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

Question

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.
Based on these data he obtained the following regression results.  The 95% confidence interval for the slope of the regression equation is
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

Quizplus · Accepted Answer

The Answer of 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.
Based on these data he obtained the following regression results.  The 95% confidence interval for the slope of the regression equation is
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

As the Carbon Content in Steel Increases, Its Ductility Tends