176 Competition for bird nest holes. The Condor (May 1995) published a study of competition for nest holes among collared flycatchers, a bird species. The authors collected the data for the study by periodically inspecting nest boxes located on the island of Gotland in Sweden. The nest boxes were grouped into 14 discrete locations (called plots). The accompanying table gives the number of flycatchers killed and the number of flycatchers breeding at each plot. The data are saved in the CONDOR file.

a. Calculate the mean, median, and mode for the number of flycatchers killed at the 14 study plots.

b. Interpret the measures of central tendency you found in part a .

c. Graphically examine the relationship between number killed and number of breeders. Do you detect a trend?

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Number Killed 0 1 2 3 4 5 30 124 Number of Breeders 46 68 22 34 38 28 30 30 26 132 86 100 32 6 Reprinted with permission of the author and the Cooper Ornithological Club. University of California Press, from The Condor, "Interspecific competition for nest holes causes adult mortality in the collared flycatcher" by J. Merila and D.A. Wiggins. The Condor, Vol. 97, No. 2, May 1995, p. 447. Permission conveyed through Copyright Clearance Center, Inc.