•Use observed lognormal
distribution.
•Natural logs of Sb in
the five samples are 6.73, 6.68, 6,40, 6.43, 6,46.
•Means and standard
deviations of the two groups are 6.71±0.04 and 6.43±0.03.
•Two-sided p < 0.0028. (< 1/360 chance
that the means are the same)