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Bird colonies One of nature’s patterns connects the percent of adult birds in a colony that return from the previous year and the number of new adults that join the colony. Here are data for $13$colonies of sparrow-hawks:$4$

(a) Describe the direction, form, and strength of the relationship between number of new sparrow-hawks in a colony and percent of returning adults.

(b) For short-lived birds, the association between these variables is positive: changes in weather and food supply drive the populations of new and returning birds up or down together. For long-lived territorial birds, on the other hand, the association is negative because returning birds claim their territories in the colony and don’t leave room for new recruits. Which type of species is the sparrow-hawk? Explain.

Step by step solution

01

Part(a) Step 1: Given Information 

From Exercise $6$we get graph as

02

Part(a) Step 2: Explanation 

Direction: Because the scatterplot slopes downhill, the direction is negative.

Form: Because the scatterplot lacks curvature and the points appear to nearly lie on a line, the form is linear.

Strength: Moderate, due to the distance between the spots, although the linear pattern is visible.

03

Part(b) Step 1: Given Information 

From Exercise, $6$we get graph as

04

Part(b) Step 2: Explanation 

Direction: Because the scatterplot slopes downhill, the direction is negative.

Because the variables have a negative correlation, we may deduce that the birds are long-lived territorial birds.

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