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Re:Sea Change – The Pacific's Perilous Turn by zeteo on Friday September 13, 2013 @09:04PM (#6384186)
http://en.m.wikipedia.org/wiki/Null_hypothesis

Sorry, a bit in a rush but that's the main idea. Expecting no specific change is the scientific default.

Re:Sea Change – The Pacific's Perilous Turn by msellout on Friday September 13, 2013 @10:58PM (#6384481)
That may be the default of a t-test. Have you considered a Bayesian analysis?