Hi there, I got a problem with the example "students_t_single_sample.cpp". The corresponding document is at: http://www.boost.org/doc/libs/1_55_0/libs/math/doc/html/math_toolkit/stat_tu... Actally, I am confused with the mathematical logic rather than coding. The document presents a table that shows four hypothesis and tests, I am OK with the frist two, but for the third and the fourth ones: The original text: Hypothesis 3: the sample mean is less than the true mean Test 3: Reject if CDF of t > significance level, cdf(dist, t) > alpha I think p-value should be the integral from t to +Infinite: cdf(complement(dist, t)), So reject Hypothesis 3 when cdf(complement(dist, t)) < alpha, or say cdf(dist, t) > 1-alpha The original text: Hypothesis 4: the sample mean is greater than the true mean Reject if complement of CDF of t > significance level: cdf(complement(dist, t)) > alpha Similarly, the p-value should be the integral from -Infinite to t: cdf(dist, t), so reject Hypothesis 4 when cdf(dist, t) < alpha Is that right? Thanks. Zhiyu Li 2014-01-11 lizy10b