Dear Mclaren,
Another further questions about your answer which I did not understand. As you mentioned the Ho is (D1A1-D2A1) = (D1A2- D2A2), why did you rearrange null hypothesis sequence to D1A1-D1A2 - (D2A1-D2A2) in stead of interpreting the negative interaction as (D1A1-D2A1) < (D1A2-D2A2)? Thank you in advance.
Joyce
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