Why isn't my table self-checker working?

Can anyone tell me what “stupid” I have committed on slide 3 to keep the table self-check function from working. I’m stumped. Thanks in advance.

Chi-Squared Practice Problems

The first column with the labels is column 0. So reduce your column numbers by 1.

That fixed it. Wow, I’ve never seen table numbers starting with zero so never would have guess this fix. Looking back at the examples (CL Checker) I’d been using I now see that they didn’t have a left label but rather had entered values into the first column to look like labels. Thanks again.

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Well, the top row is 0, since we typically start with the first row of data as (1,1).