You can use an exact Binomial test;

Online reference:

http://en.wikipedia.org/wiki/Binomial_test.

SPSS;

http://academic.udayton.edu/gregelve...ominaldata.htm

Other references:

Clopper, C. J. & Pearson, E. S. (1934). The use of confidence or fiducial limits illustrated in the case of the binomial. Biometrika, 26, 404–413.

William J. Conover (1971), Practical nonparametric statistics. New York: John Wiley & Sons. Pages 97–104.

Myles Hollander & Douglas A. Wolfe (1973), Nonparametric statistical inference. New York: John Wiley & Sons. Pages 15–22.

good luck,