## Here is the data set "PotashData".  It consists of the strengths of
## different bundles of cotton grown under five different treatments,
## i.e. levels of potash, a fertiliser.  For each treatment level, there
## are three replications.  The treatment levels (in lbs of potash per
## acre) were 36, 54, 72, 108, 144 respectively.
##
7.62 8.00 7.93
8.14 8.15 7.87
7.76 7.73 7.74
7.17 7.57 7.80
7.46 7.68 7.21