Fig. 2

Distributions of correlation coefficients for different groups. Box plots of the correlation coefficients between taxonomic distance and each student’s responses are displayed above. The heavy line in the box indicates the median; the box itself includes the first and third quartiles; the whiskers extend to the most extreme point that is more than 1.5× the interquartile range; the circles indicate outliers. The versions above correspond to the survey versions in Table 2; “Correct Definition” corresponds to the students who completed version C of the survey and correctly defined common ancestry