This period varies normally. At the beginning of the study, the researchers measured many variables on the subjects. Because low scores should indicate a Mexican cultural orientation, these results helped to establish the validity of the test. The detector readings were as follows. The distribution is somewhat skewed to the right, but not strongly enough to forbid use of the t procedures.
Gas chromatography is a sensitive technique used by chemists to measure small amounts of compounds.
The response of a gas chromatograph is calibrated by repeatedly testing specimens containing a known amount of the compound to be measured. The response is known from experience to vary according to a normal distribution unless an outlier indicates an error in the analysis. Then explain to a chemist who knows no statistics what your margin of error means. Large trees growing near power lines can cause power failures during storms when their branches fall on the lines. Power companies spend a great deal of time and money trimming and removing trees to prevent this problem.