[R] acutally a statistics question

[Jan Malte Wiener]

hi,
knowing there are a lot of statistics guru's in the R-mailing list, i 
throw in a statistics question.

i have data that i do not know how to statistically test:

subjects are repeatedly asked to make a decision (e.g. left-right -> 
coded as 0 or 1). i have 20 subjects, each subject made 8 decisions.

i now want to analyse whether my experimental manipulation induced a 
systematic bias in subjects answers. if that wasn't true i expected a 
chance level of 0.5 (50% left, 50% right).

the way i am analysing my data right now is that i calculate the mean of 
the single trials for each subject (mean of (0,1,1,1,1,0,0,1) = 0.625).
now i have a vector of single subjects preferences.

assuming this distribution was normally distributed i could perform a 
one-sample t-test against a chance level (e.g. 0.5).
obviously my data are not normally distributed -> so i guess my question 
really is: which non-parametric test does test a distribution against a 
given theoretical value (and of course-> does it exist in R) ?

thanks for any help,
jan wiener

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