This list is fake. It was creation of a Usenet poster. From what I recall the fake IQ scores were derived by using per capita state income data, or at least that was the claim. Income and IQ correlate, but not very well. Other people have used standardized test scores to estimate a state's IQ (like the SAT). That is better than income, at least.
Anyway the only way Connecticut could have such a high average IQ was if every non-Jew in the state died*. And the only way Mississippi would have such a low average IQ... well... actually.
*ashkenazi jews have an average IQ between 107 and 115.
Not a damn thing. IQ is what you bring to the table, tabula rasa style.
Then it's not much of a tabula rasa.