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    i am doing course work and have data that is unrelated, and i believe to be interval??????

    the test was for recall at diff levels of processing- so there are recalled word results and incorrect results for every participant in each of the 3 conditions.
    i want to comapare two conditions at a time to find if there is a significant difference between the 2.

    what test sholud i use- unrelated t-test or man-whitney u???
    is my data definately ordinal?

    its an emergency deadline looming.
    thanks

    sorry that should be is data definately interval???
    thanks
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    Its sounds like ratio data to me as you cant get a minus number of answers correct. Unless you are taking one set of scores away from another when it is possible to get a minus number, then it would be interval. Basically, if the data has a true zero point, it is ratio but if it can have minus numbers, it is interval.

    I think you are using a repeated measures design as all of the participants are doing all three tests, which would suggest you need to use the related t-test.

    Hope that helps.

    Helen Brownsell
 
 
 
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