Deber de Predicción

http://books.google.com.ec/books?id=RbaC-wPWqjsC&pg=PA418&lpg=PA418&dq=estadistica+demostracion+suma+cuadratica+total&source=bl&ots=WN6n4EC7uX&sig=v88wQN_JGPbnENyeUtoGGZn-JxA&hl=es&ei=V_swS7iJGYmVtgeC9Zn9CA&sa=X&oi=book_result&ct=result&resnum=8&ved=0CCAQ6AEwBw#v=onepage&q=&f=false

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