Now I'm sure there is a simple answer to this, but wondered if anyone can explain why in the notes, the chi squared statisitc is in one place defined at the sum of the Zx squareds (the standardised deviations), yet in another place it is calculated as the more familiar (A-E)^2/E The methods will produce different Chi values right? Or maybe not! The (A-E)^2/E is the Chi^2 statisitc as I've always been taught.
Good quesion bro! I was battling over that for an entire afternoon...in one of the sections in CH12 it is mentioned that qx(1-qx) is approximate to qx...that's the key! Now you can figure it out
