Bernoulli trial
where formula_4 is the proportion of successes in a Bernoulli trial process, measured with formula_5 trials yielding formula_6 successes and formula_7 failures, and formula_8 is the formula_9 quantile of a standard normal distribution (i.e., the probit) corresponding to the target error rate formula_10. For a 95% confidence level, the error formula_11, so formula_12 and formula_13.