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3

I indeed think that it is not possible to conclude that the scales are used differently, based on variance alone. Normally one would assume the scale is used properly and the effect you see is indeed the result of (not) having a trained ear. There do exist ways to investigate how one uses a subjective scale. In a paper I presented, we looked at how people ...


2

Leave it at 0.05 . SPSS corrects it properly. Only when you want to test with different alpha's (.10 or 0.01 e.g.) you should change it.


1

No, I don't think so . Greater variance could reflect variance in perception just as much as variance in the way the rating scale is used.



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