A random sample of 15 families representing three social classes has been observed for the frequency with which the parents administer physical punishment to the children over a period of a week. Are the differences significant? Use the five step model as a guide and write a sentence or two of interpretation for your results.

Working Class	Middle Class	Upper Class
10	11	7
9	10	5
4	5	2
2	2	0
1	0	0