57 Chepter 3 Estimating Population Sine Questions (Method A) 1. Why was it impor

Question

57 Chepter 3 Estimating Population Sine Questions (Method A) 1. Why was it important to shake beans out onto the table in your second sample, rather than picking them out of the jar by hand? Can you imagine similar sampling issues arising with the box turtle example from the Introduction? 2. If you did not shake up the beans very well after returning them to the jar, how would that have affected your estimate of population size? Can you imagine a comparable problem arising in a field study? Looking at the formula for confidence intervals, how would affected by increasing the size of the second sample? How would it be affected by marking a larger number of individuals? 3. Suppose one of your classmates simulated a predator by removing some of the beans from the jar between the release of your marked individuals and your second sample. Would your estimate of population size be too high or too low? Explain why 4. 5. Suppose one of your lab partners simulated emigration and immigration between the release of your marked individuals and your second sample. Your partner removed a third of the population and replaced it with an equal number of new beans from the grocery store. Would your estimate of population size be too high or too low? How would your error compare with the previous example?

Explanation / Answer

1. By picking with hand, some contamination may be introduced. Also beans might break or some other mishappening may occur, so it is always better to spread the beans on table rather than picking by hand.

2. If the beans are not shaken well after returning to the jar, there may be certain spaces which would be left unfilled. And hence overpopulation might be estimated if the jar is not shaken after returning the beans.

3. By increasing the size, confidence interval should not be affected. While by increasing the number of individuals, it should be increased.

4. When the beans are removed, the estimation of population size will be low.

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