Break down the annual salaries into three groups according to training level (A, B, or C).
a.* Draw box plots to compare these three groups. Comment on what you see.
b.* Find the average for each training level, and comment.
c.* Find the between-sample and the within-sample variabilities and their respective degrees of freedom.
d. Find the F statistic and its numbers of degrees of freedom.
e. Perform the F test at level 0.05 and report the results.
f. Report the results of the least-significant-difference test, if appropriate.
g. Summarize what you have learned about the database from this problem.