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Table 6 Results of principal components analysis of students’ responses to versions C and D

From: Freshman Undergraduate Biology Students’ Difficulties with the Concept of Common Ancestry

Question PC1 PC2
N1 0.105 −0.533
N2 0.182 −0.288
N2.1 0.084 −0.492
N3 0.169 −0.415
H3 0.166 −0.282
N4 0.316 −0.009
N4.1 0.321 −0.065
N5 0.288 0.050
H5 0.345 0.201
N6 0.367 0.184
N6.1 0.310 0.078
N7 0.357 0.154
H7 0.359 0.167
  1. The question designations refer to the designations in Table 2. PC1 and PC2 refer to the first and second principal components, respectively. Loadings greater than 0.25 are highlighted in bold type