Fig. 11

Percentage of biology majors (black bars) versus nonmajors (white bars) who agree with one of the following statements concerning evolution in science exams: A = I have no problem answering questions concerning evolution, B = science exams should always include some questions concerning evolution, C = do not know enough to say, D = I prefer to not answer questions concerning evolution. Comparisons within institutions: a RWU biology majors (n = 237) versus nonmajors (n = 239), Chi-square = 10.508, df = 3, P = 0.01; asterisks indicate sign test two-tail pairwise comparisons P ≤ 0.05. b PC biology majors (n = 212) versus nonmajors (n = 143), Chi-square = 2.069, df = 2, P = 0.35. c RWU within-biology-majors comparisons: F = freshman (n = 93), So = sophomore (n = 74), J = junior (n = 33), Sr = senior (n = 37), Chi-square = 15.455, df = 6, P = 0.01. d PC within-biology-majors comparisons: F = freshman (n = 70), So = sophomore (n = 34), J = junior (n = 50), Sr = senior (n = 58), Chi-square = 0.542, df = 3, P = 0.91; combined biology majors (mean of F + So + J + Sr) for A vs. B differ, sign test two-tail P ≤ 0.05