Linear Regression Interpreting output

[#1]

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!

sigi2408_2-1637744088605.png

sigi2408_1-1637743774580.png

[#2 · Accepted solution]

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

[#3]

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)

[#4]

I come up with 2.69

[#5]

The first image in your post (the histogram) can't be used to determine the value of A when C = 0. You can determine the value of A when C = 0 by solving the regression equation in second image by substituting 0 for C and then algebraically solving the equation 0 = 5.565 - 2.067*A. Or do it the cool way...use the JMP cross hair tool from the tool bar and find the value of A when you put the cross hairs over the red line when C = 0. Either way the answer is 2.69.

[#6]

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.

[#7]

That's one of the cool things about JMP...very often there are multiple ways to visualize, interpret, and gain insight wrt to data and a problem at hand. One thing I always coached my JMP user friends is "Try them all!" You might find something unique you weren't even looking for! Then the real fun begins:)

[#8]

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?

[#9]

I got only those two outputs from JMP that according to them I need to answer a few questions.

One of them was to find A when C=0.

I think you are all right and I just wanted to make sure...and tell the professor =]

Thank you!