They have to be by definition. One is the assumed hypothesis (null) and the other is an alternate (what is true if the null hypothesis isn't). By the very definition of the terms, they can't both be true. So H0: X= N goes with the alternatve H1: X IS NOT EQUAL to N.|||if they were'nt the experimental design would be impossible how can we have h0: there was no variance attributable to the treatment condition AND say hA: there is variance due to treatment condition AND have both be simultaneously true its like saying "the next sentence is true. The preceding sentence was false"
get my drift???
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