I have 2 data sets, one is my control, one experimental, and I have 4 distinct phenotypes resulting, which I'll call A, B, C and D.

Control: A - n=18, B - n=0, C - n=0, D - n=0
Experimental: A - n= 3, B - n=20, C- n= 0, D - n=0.

What I want to show is that in the experimental case, the number falling into B is stat sig. (which just looking at the numbers seems pretty clear to me), but nonetheless I need to do a test on it.... I'm just not sure what to do..???

2. You don't require any statistical test here.( It will be bit funny if you do stat stuff here).
If you wanted to do statistical test, you can try Chi-Square Test for Homogeneity.

3. Thanks for your reply, but I'm not sure I understand why I wouldn't need stats here...? I'd be really grateful if you could explain a bit more!

4. See the link below for test of homogenity. http://stattrek.com/AP-Statistics-4/...?Tutorial=Stat

And If your interest is only B, in that case two sample proportion test can be used.
consider Bs are succes
i.e. Control = 0&#37; , Experimental = 20/23

http://www.talkstats.com/showpost.php?p=13562

I think this will be simple

5. Thank you very much!

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