A medical researcher took blood samples from 31 children who were infected with malaria and determined for each child the number of malaria parasites in 1 ml of blood.
A data frame with 31 observations on the following variable.
the number of malaria parasites
M.L. Samuels and J.A. Witmer (2003). Statistics for the Life Sciences (3rd ed.). Pearson Education, Inc., New Jersey.
C. B. Williams (1964) Patterns in the Balance of Nature. Academic Press, London.