=+5.54 ● The paper “Aspects of Food Finding by Wintering Bald Eagles” (The Auk [1983]: 477–484) examined the relationship between the time that eagles spend aerially searching for food (indicated by the percentage of eagles soaring) and relative food availability. The accompanying data were taken from a scatterplot that appeared in this paper. Let x denote salmon availability and y denote the percentage of eagles in the air.

x 0 0 0.2 0.5 0.5 1.0 y 28.2 69.0 27.0 38.5 48.4 31.1 x 1.2 1.9 2.6 3.3 4.7 6.5 y 26.9 8.2 4.6 7.4 7.0 6.8