Fig. 1

a Percentage of biology majors (black bars, n = 231) and nonmajors (white bars, n = 236) who consider one of the following explanations about the origin and development of life on Earth should be taught in science classes: A = evolution, B = equal time to evolution, creationism, intelligent design, and C = do not know enough to say. Raw data chi-square = 16.594, df = 2, P value ≤ 0.001; asterisks indicate Sign test two-tail pair-wise comparisons P value ≤ 0.02. b Percentage of freshman (F), sophomore (So), junior (J), and senior (Sr) biology majors who consider that A, B, or C (above) should be taught in science classes. Chi-square of percentage values = 22.129, df = 6, P value = 0.001