Ok.....sort of... Im still not fully clear, but rest assured you have already done a far superior job to my tutors.
Lets say that VD dialling and TST dialling in quiet conditions both show a very similar performance in terms of dialling speed. When noise is introduced, however, VD becomes much slower than TST because the voice recogniser has a lot of interference to deal with. My 2 t-tests would show a non-significant difference between the systems in quiet conditions and a significant difference between them in noisy conditions. What will the ANOVA show? So far i just cant see how the results from an ANOVA can describe such a clear distinction as this. p.s - It would really help me if you framed your anwer in terms of the output i will get from SPSS. When i ran the ANOVA i did 2 factors (noise/quiet) with two levels (TST/VD). The output gives three figures: Noise = X Quiet = X Noise*Quiet = X Im just really not sure what each figure relates to - what is the implication of each of these figures? Also - when you say "don't significantly differ from zero" i assume you are not talking about significance (p) values (where a value CLOSE to zero indicates a strong effect) - am i wrong? Thanks once again for your help, DN . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
