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which statistical test am i doing? (super quick) watch

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    mann whitney U, t-test or spearmans ranks?

    i did a belt transect of 20 metres, 20 readings, also took soil temperature and above ground temperature.

    i also have 3 soil samples at 0m, 10m, and 20m.

    i can't remember which one i have to do..?

    thanks in advance

    - spence.

    PS my investigation is too see if biological and other factors affect the species density of birdsfoot trefoil away from a group of trees..

    i think it is spearman's rank but i'm not certain.
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    you can't use mann whitney u test because you have 3 groups of data, and mann whitney only tests differences in two sets of data.
    spearman only tests linear correlation.
    t-test is similar to mann whitney but t-test needs a large sample.
    hope that helps.
 
 
 
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