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. Following are data for 13 colonies of sparrowhawks:
Percent return 73 61 79 54 75 62 53 46 57 50 62 45 35
New adults 4 7 7 10 13 16 16 15 16 18 18 20 20
Use your calculator or software to find the correlation (± 0.001) between the percent of returning birds and the number of new birds:
Below is the scatterplot of the original data (green) and two new points added. Point A (blue): 9% return, 25 new birds. Point B (red): 40% return, 9 new birds.
Find the new correlation (± 0.001) for the original data plus Point A:
Find the new correlation (± 0.001) for the original data plus Point B:
Adding point A makes correlation
Weaker
Stronger
1 answer
3 answers