A random sample of 200 married men, all re¬tired, were classified according to education and number of children:
Number of children
Education 0-1 2-3 Over 3
Elementary 14 37 32
Secondary 19 42 17
College 12 17 10
Test the hypothesis, at the 0.05 level of significance, that the size of a family is independent of the level of education attained by the father.