Don't know and it does not matter. I had to take 4 levels of stat in college to get my degree. Loved it, frankly. One of the basic principles is the quality and relevance of the "sample". For example, if you wanted to know how the population of the world felt about green beans, you could not possibly ask everybody, so you would determine what a relevant sample would be and use it to predict the opinion of the total population. You would NOT ask 100 people.
They have been keeping records on weather for what, 100+ years? I don't think they have a big enough sample to adequately predict anything or make statements like they are. While I am sure that archeology to some extent can help them expand their sample, a lot of that is going to be guess work.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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