and x is the sample mean, n is the number of samples, and xi is the ith sample; or,
and x is the sample mean, s is the sample standard deviation, n is the number of samples, and t0.95 is the t statistic for a 95 percent one-tailed confidence interval with n-1 degrees of freedom (from appendix A of subpart B of part 429).
10 C.F.R. §429.76