Sixty-four students in an introductory college economics class were

     15.18 Sixty-four students in an introductory   college economics class were asked how many credits they had earned in   college, and how certain they were about their choice of major.    Research   question:   At   α = .01, is the degree of certainty independent of credits earned?   

         Very uncertain Somewhat certain Very certain Total   0 – 9 12 8 3 23   10-59 8 4 10 22   ≥ 60 1 7 11 19   Total 21 19 24 64