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    • Thread Starter
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    Hi,

    I am freaking out a bit and any help would be greatly appreciated!!

    I was told by my teacher that it is appropiate to use mann whitney for my experiment but i don't understand why and my results seem to indicate that i need to use spearmans rank i think

    Basicly I am measuring the effect different wavelengths have on phototaxis response (whether they move towards or away from the light).

    I have used 6 different wavelengths and done 6 repeats on each.

    my results showed that the lowest one showed a negative phototaxis and then it increased up to a maximum then began to decrease as i increased the wavelength further, forming a curve.

    does mann whitney have to be in data pairs? and they have to be independent?

    basically it would great if someone could offer me some help as to which test to use as i am so confused :s

    Thank you!
    • Study Helper
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    I would just listen to your teacher if I were you, and use spearmans rank. I doubt that he is trying to get you bad grades
 
 
 
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