Jimmy98 Posted March 17, 2016 Report Share Posted March 17, 2016 Hello, I'm currently writing my IA in Psychology HL about Loftus and Palmer 1974. For calculating the inferential results I have used the Mann-Whitney U test and justified it by saying that I used an independent meeasure design in my experiment. I don't really know if that's enough for justifying it or if I should include other reasons? Thank you for the help. Reply Link to post Share on other sites More sharing options...
blindpet Posted March 17, 2016 Report Share Posted March 17, 2016 You probably measured speed of the car which is technically an interval/ratio data level so the appropriate test would be a t-test. However, because you probably have a small data set then tests for ordinal data like Mann Whitney are justified as they tend to be less likely to give false positives (it is usually harder to get a small p value for Mann Whitney compared to a t-test). That is the justification I would use. Basically the choice of inferential test depends on the design (indpendent vs repeated measures) and the measurement level of the data (interval/ratio, ordinal, nominal) as well as the sample size. Reply Link to post Share on other sites More sharing options...
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