SPSS help!! If i have ONE dependent variable (reaction time), 3 independent variables (stimuli based) and 2 groups (bilingual and monolingual).What statistical test should I use in SPSS?
I don't think that I have enough detail to posit an answer. You should start with the research question(s), not the statistical analysis.
You say that you have "3 independent variables and 2 groups." Why is it that the lingual (bi or mono) is also not an independent variable? [I use your term "independent" variable here, and its use is customary, but I actually believe that its use should be restricted to the experiment.] Assuming you have 3 or 4 "independent" variables you should be able to model them predicting reaction time. A simple solution, if your data meet assumptions, would be a regression. If this seems to fit your question(s), then I would also encourage you to consider moderation effects if reasonable. There is, of course, more to be said, but rather than meander through possibilities, it is more efficient for you to explain more about your questions, design, and variables.
I don't have enough details but would recommend you use multiple linear regression.
The kind of analyses you will perform on SPSS depends on the research question you intend to answer by your experiment. Are you testing if the response time for the bilingual is different from the monolingual? Or do you want to build a model? John Morris answered rightly
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