As in other vertebrates, individual zebrafish differ from one another along the shy–bold behavioral spectrum. In addition to other differences, bolder individuals tend to be more aggressive, whereas shy individuals tend to be less aggressive. Norton et al. (2011) compared several behaviors associated with this syndrome between zebrafish that had the spiegeldanio (spd) mutant at the Fgfr1a gene (reduced fibroblast growth factor receptor 1a) and the “wild type” lacking the mutation. The data below are measurements of the amount of time, in seconds, that individual zebrafish with and without this mutation spent in aggressive activity over 5 minutes when presented with a mirror image.

a. Draw a boxplot to compare the frequency distributions of aggression score in the two groups of zebrafish. According to the box plot, which genotype has the higher aggression scores?

b. According to the box plot, which sample spans the higher range of values for aggression scores?

c. Which sample has the larger interquartile range?

d. What are the vertical lines projecting outward above and below each box?

Transcribed Image Text:

Wild type: 0,0, 21,21, 22,22, 28,28, 60,60, 80,80, 99,99, 101,101, 106,106, 129,129, 168168 Spd mutant: 96,96, 97,97, 100,100, 127,127, 128,128, 156,156, 162,162, 170,170, 190,190, 195195