Unit 1 Contents

1. Estimate the total number of birds that were captured.
2. What was the median number of birds captured? Which type of bird had the median number captured? Show or tell how you know.
3. Were more vireos (red-eyed and white-eyed combined) captured than wood thrushes? Show or tell how you know.

Making Predictions: Mass vs. Wing Length

7. The ornithologists measured the wing length and mass for white-eyed vireos. They measured the length of the wings in millimeters (mm) and the mass in grams (g). They recorded their data in the table below:

1. Make a point graph of the data for white-eyed vireos. Plot wing length on the horizontal axis and mass on the vertical axis. Scale your horizontal axis to 100 millimeters and your vertical axis to 20 grams.
2. Using the graph, estimate the average wing length of the white-eyed vireos that were captured.
3. Using the graph, estimate the average mass of the white-eyed vireos that were captured.
4. Use the data in the table to find the exact value of the median wing length.
5. How does your answer for Part B compare with your answer for Part D?
6. Another bird, the yellow-breasted chat, typically has a wing length of about 75 millimeters and a mass of about 25 grams. If you measured the wing length and mass for several yellow-breasted chats, where on your graph would the data cluster?