Birds of the Caribbean islands of the Lesser Antilles are descended from immigrants originating from larger islands and the nearby mainland. The data presented here are the approximate dates of immigration, in millions of years, of each of 37 bird species now present on the Lesser Antilles (Ricklefs and Bermingham 2001). The dates were calculated from the difference in mitochondrial DNA sequences between each of the species and its closest living relative on larger islands or the mainland.

a. Plot the data in a histogram and describe the shape of the frequency distribution.

b. By viewing the graph alone, approximate the mean and median of the distribution. Which should be greater? Explain your reasoning.

c. Calculate the mean and median. Was your intuition in part (b) correct?

d. Calculate the first and third quartiles and the interquartile range.

e. Draw a box plot for these data.

Transcribed Image Text:

0.00,0.00, 0.00,0.00, 0.04,0.04, 0.21,0.21, 0.29,0.29, 0.54,0.54, 0.63,0.63, 0.88,0.88, 0.96,0.96, 1.25,1.25, 1.67,1.67, 1.75,1.75, 1.84,1.84, 1.96,1.96,