Dr. Awiakta, working with an international relief group, suspects that the marital status (single, married, or divorced) of a child's mother is associated with the highest level of the mother's education (grade school, high school, or college). To investigate, Dr. Awaikta collects data for 87 participants, sets the alpha level to .05, determines the critical value to be 5.991, and calculates the test statistic to be 6.321. What is the effect size for their study? (Round your answer to two decimal places.) O a. .22 b. .19 c. .26 d. .13