Computes confidence intervals
for the (Gaussian) population parameters, μ and σ.
In the case of σ, two intervals are computed:
the classical interval with equal left and right probability tails;
and the narrowest interval, the tails being recalculated and shown.
Graphs are drawn showing: the Student distribution
(in the problem's physical units); and the χ²
distribution, in the "classical" case only (as the narrowest interval is
practically the same). Their cumulative functions are included,
as well as corresponding (shaded) areas. | 
