Using a Graph to Test Check a Slope Value

[Aaron_Osowiecki]

Hello,

I am trying to have my students collect (x, y) data and then determine the slope of a linear regression. I developed this lessonwhere students enter the data and then calculate the appropriate slope, which I built in a check so students can see if they are correct.

The check calculates the slope using the equations for linear regression with 5 data points. However, the data must go through (0,0) and the linear regression calculation is for a non-zero intercept. Is there a way, to use pull the slope from a graphical calculator like this one, to use as the check?

With the sample data I put in the Lesson, the y=mx+b regression returns a slope of 16.3, while the y=mx regression from the graphical calculator returns a better value of 19.1.

[bhssingul (mike,but dont call me that!)]

maybe use the legitamite equation for figuring it out the slope?

[Anna_Scholl]

In your Graph3 component, you can define the regressions as you did in your calc example. Then, you can call on the k values in your table component

regSlope1 = Graph3.number(k_{1})
regSlope2 = Graph3.number(k_{2})
and set those to your table cell content.