Tests and confidence intervals based on two normal samples
with common variance.
[pval, cidiffmean, cisigma] = test2n(x,y,CL)
Input x,y samples (column vectors)
CL confidence level for the confidence intervals
(default 0.95).
Output pval probability that Student statistic based on x and y
is as far from 0 as it is actually, or further away
under hypothesis that theoretical means are equal.
cdiffmean confidence interval for the difference of means.
cisigma confidence interval for the standard deviation.
(Confidence intervals of the form [LeftLimit, PointEstimate, RightLimit]).