Chi-square Test of Independence using CNN exit polling data

If you are trying to explain the Chi-Square Test of Independence to your students, here are some timely examples that are political and not polarizing. Well, I don't think it is polarizing. I'm sure there are people out there that disagree. Maybe some of the questions are polarizing? Regardless, it is nice to have an example that uses a current event with easy to understand data.

The example comes from CNN. The network conducted exit polling during the 2020 presidential election. I'm sure they didn't intend to provide us with a bunch of chi-square examples, but here we are.

Essentially, CNN divided Biden and Trump voters into many categories with not a parameter to be had. I have included a few of the tables here, but there are many others on the website.

They illustrate different designs (2x2, 2x3, 2x4, etc.) and different magnitudes of difference between expected and observed values.

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