What is randomization?
Randomization requires two criteria:
A good example of proper randomization for a national
All elements within a population have an equal chance of selection.
No single element can be selected more than once.
Laumann, E. O., Michael, R. T., Gagnon,
J. H. & Michaels, S. (1994). The Social Organization of Sexuality:
Sexual Practices in the United States Chicago: University of Chicago
A good example of improper randomization for
a national sample see:
Hite, S. (1987). Women and Love: A Cultural
Revolution in Progress. New York: Alfred A. Knopf.