Darwin's Plant Height Differences

SUMMARY:
       The darwin data frame has 15 rows and 1 columns.

       Charles Darwin conducted  an  experiment  to  examine  the
       superiority   of   cross-fertilized   plants   over  self-
       fertilized plants.  15 pairs of  plants  were  used.  Each
       pair  consisted  of  one  cross-fertilized  plant  and one
       self-fertilized plant which germinated at  the  same  time
       and  grew  in  the same pot. The plants were measured at a
       fixed time after planting and the  difference  in  heights
       between the cross- and self-fertilized plants are recorded
       in eighths of an inch.

DATA DESCRIPTION:
       This data frame contains the following column:

y:     The difference in heights for  the  pairs  of  plants  (in
       units of 0.125 inches).

SOURCE:
       The data were obtained from

       Fisher, R.A. (1935)  Design  of  Experiments.  Oliver  and
       Boyd.

OTHER REFERENCES:
       Darwin,  C.  (1876)  The  Effects  of  Cross-  and   Self-
       fertilisation in the Vegetable Kingdom. John Murray.

       Davison, A.C. and Hinkley, D.V. (1997)  Bootstrap  Methods
       and Their Application. Cambridge University Press.