One of the psychologist's findings is that 18 months after the workshop, a sample of 49 job seekers who received training on setting career goals scored an average of 6.5 as measured on a 9-point job search satisfaction scale, with a standard deviation of 1.2.The typical job seeker scores 5.8 points. The psychologist finds that the estimated Cohen's d is:.
a) 0.583
b) 0.015
c) 4.084
d) 0.438