st: Which test to use?

[Toby <spiegeldesaster@googlemail.com>]

Hello,

I have data of the following character


decision      X      Y
34               1      0
34               1      0
56               0      0
77               0      1
23               0      0


X and Y take the function of categorizing the variable decision. If I
take the mean value of X I get the frequency of decision that could be
classifed as X, the same holds for Y. It could never be that X and Y
take the value 1 at the same time.
Now I want to test whether the frequency of X is significantly
different from the frequency of Y. Can anybody help me figuring out
which statistical test I have to use?

Kind Regards,
Toby
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