If there is only one group, then the null tested is that the underlying probability of success is p , or .5 if p is not given. The alternative is that the probability of success is less than, not equal to, or greater than p or , respectively, as specified by alternative . A confidence interval for the underlying proportion with confidence level as specified by and clipped to [0,1] is returned. Continuity correction is used only if it does not exceed the difference between sample and null proportions in absolute value. The confidence interval is computed by inverting the score test.