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Politics : Mainstream Politics and Economics -- Ignore unavailable to you. Want to Upgrade?

To: Sdgla who wrote (6870)1/14/2012 12:20:53 PM
From: koan  Respond to of 85487
 
<<How many scientists are there ?

Irrelevant, professionals like PEW polling use sample populations which they can then apply statistical methods to, and can predict things to a very high degree of probability.

Say you have two acres of land and on one acre you apply fertilizer and on the other you don't, and you want to know if, and how much, the fertilizer had an impact on the crop you are growing. A simple t test will give you a pretty good idea.


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