Using the amount of total registered voters in each respective state and a 95% CI, we get the following margins of error
MI: ±3.939%
PA: ±3.723%
WI: ±3.811%
Depending on the exact lead (NYT only shows round percents, not specific numbers for each response), all of those are potentially within the top end of that margin of error.
Am I trying to claim that a swing from being down by ~4% to being up by ~4% means nothing and is indicative of nothing? Of course not. But man, most people really do not at all understand how statistics work, and I really wish people would stop talking out of their ass about it.
If I remember this correctly, the square of the error for the sum of (or difference between) two (independent 😬) variables is the sum of the squares of the individual errors. Gauss something.
That would make the error for the 8 point swing be sqrt(2×3.8²) or about 5.4. So at least the swing is significant in each state.
Also, the error for the average of 3 variables is sqrt(e1²+e2²+e3²)/3 or 2.2 so the average lead in the 3 states is significant.
But we can't make a significant claim about the lead in each state.
It’s easy. When Kamala is down we say that polls don’t matter as much they used to, but when she’s up polls are obviously right. The margin of error is just a thing we use after the fact to justify whether the polls are useless (Kamala losing) or absolutely correct (Kamala winning)
Maybe not, but it's encouraging! Harris/Walz are stoking enthusiasm because they want to actually improve people's lives, not just repeat the same tired culture-war bullshit...