16. To decide whether chemistry or physics majors have higher starting salaries in industry, n B.S. graduates of each major are surveyed, yielding the following results (in $1000 s):

Sample Sample Major Average SD Chemistry 41.5 2.5 Physics 41.0 2.5 Calculate theP-value for the appropriate two-sample z test, assuming that the data was based on n  100.

Then repeat the calculation for n  400. Is the small P-value for n  400 indicative of a difference that has practical signi cance? Would you have been satis ed with just a report of the P-value? Comment brie y.