Question

1. There is variation in the migratory behavior of certain bird species. Some populations migrate while others do not. A study was run on Blue-Tailed Bee-Eaters. The south-east Asia population migrates south for the winter while the Australasia population does not. Using a capture technique called mist-netting, wing lengths were measured for each population. Is there a statistically significant difference between the two populations? What conclusion can you draw from this information?

Use your reading handout to calculate all the necessary parts of a t-test. Use an alpha=0.25 in the t-table to find your critical value.

Population A                                                                                             Population B

(South-East Asia, Migratory)                                                       (Australasia, Non-migratory)

Wing length (cm)                                                                         Wing length (cm)

      31                                                                                                        47

      50                                                                                                        41

      30                                                                                                        41

      31                                                                                                        37

      42                                                                                                        30

      37                                                                                                        34

      50                                                                                                        35

      45                                                                                                        31

      41                                                                                                        33

      50                                                                                                        31

      45                                                                                                        37

      31                                                                                                        47

      48                                                                                                        44

      39                                                                                                        33                                      47                                                                                                  35

      48                                                                                                        37

      50

47

46

39

42

46

Answer 1