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Linear Regression Interpreting output

I have this output and I want to know what is the expected A value when C equals 0.

Don't I just set 0 in the linear equation and get A=2.6? (I've told that the answer is 3.6..

 

In addition, does anyone know what is the meaning of: "Calculate the value of the TOTAL"?

 

Thank you everyone!

 

 

 

GraphicsRe: Linear Regression Interpreting output

Setting A=0 will result in giving you the intercept value, which in your example is 5.5652114

Re: Linear Regression Interpreting output

Right, so if C=0, A will be 2.6.

And I don't need to relate to the first image? (again..only because I was told that the answer is A=3.6)

Re: Linear Regression Interpreting output

I don't get 3.6 either.  But your bivariate plot does not look linear to me - I think a quadratic would fit better.  Did you try that?  The value of C when A=0 will be higher than the 2.69 that txnelson calculated.  In any case, you should provide a bit more context to your question:  what exactly were you asked to do?  Was a linear regression a condition for the question?

Re: Linear Regression Interpreting output

Or another cool way: Use Fit Model instead of Fit Y by X. then you can use Inverse Prediction. You don't need to do any calculation or guessing with the crosshairs. Plus, you will even get a 95% confidence interval for the possible A value.