Use an odds ratio and a risk ratio to clarify the results of the Dabbs and Morris study of testosterone in Exercise 19.18. Which of those two statistics would you prefer?

Exercise 19.18

Dabbs and Morris (1990) examined archival data from military records to study the relationship between high testosterone levels and antisocial behavior in males. Out of the 4,016 men in the normal testosterone group, 10.0% had a record of adult delinquency. Out of the 446 men in the high testosterone group, 22.6% had a record of adult delinquency.

a) Create a contingency table of frequencies, classifying men by High and Normal testosterone levels and by Delinquency and Nondelinquency.

b) Compute x² for this table.

c) Plot the data in a way as to illustrate this relationship.

d) Draw the appropriate conclusions.