Unit 11 Contents

1. Refer to the Bats Captured: Conservation Club data table. Make a point graph showing all the bat data that were collected by the conservation club.
• Title the graph “Bats Captured.”
• Plot the number of bats captured (n) on the horizontal axis.
• Plot the number of tagged bats in the sample (t) on the vertical axis.
2. Refer to the Bats Captured: Eagle Family data table. Add the points showing the data collected by Professor Eagle, Sarah, and Bobby to your graph.
1. What do you notice about the points on your graph?
2. If there were no bats in a sample, how many tagged bats would you find? (n = 0, t = ?) Add this point to your graph.
3. Draw a best-fit line.

Check-In: Questions 4–6

1. Use your graph to write a ratio for  when n = 80.
2. Use your graph to write a ratio for  when n = 160.
3. Are these two ratios equivalent (or approximately equivalent)?
1. Choose two other points on your best-fit line. Use those points to write ratios for .
2. Are the ratios equivalent to (or approximately equivalent to) the ratios you found in Question 4?
1. If you take a larger sample, what happens to the numbers of tagged bats in the sample?
2. If you take a smaller sample, what happens to the numbers of tagged bats in the sample?