This page will require you to work with your copy of the State Demographics Starter File in which you should have already defined f(x) based on your work on Build a Model from Samples: College Degrees v. Income.
Type fit-model(states-table, "state", "pct-college-or-higher", "median-income", f) in the Interactions Area.
1 Find the points for AL and AK along the predictor line.
2 What do you Notice?
3 What do you Wonder?
4 In the upper left corner, you’ll see that it says "R-sqr", followed by a number. What is that number?
5 Change the definition of f so that the slope is less steep and click "Run". What is the 𝑅2 value now?
6 Change the definition of f so that the slope is negative and click "Run". What is the 𝑅2 value now?
7 Change the definition of f so that it draws a horizontal line and click "Run". What is the 𝑅2 value?
8 Change the y-intercept so that the horizontal line passes through more of the points. What is the 𝑅2 value?
9 What do you think 𝑅2 tells us?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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