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- Draw a picture of the lab. Be sure the steps are clear and the variables are labeled.
- Use t for number of tagged beans in a sample and n for total number of beans in a sample.
- Use T for number of tagged beans in the bag and N for total number of beans in the bag.
- What variables are involved in the lab?
- What do you know before you start taking samples and collecting data?
- What will you be able to find out when you finish the experiment?
- Why is it important to mix the tagged beans thoroughly with the untagged beans?
- Collect the data. Record the number of tagged beans (t) and the total number of beans (n) for each of the 12 samples. Use the Bats in a Cave Data Table page in the Student Activity Book.
- Use the data table to write the number of tagged beans in a sample as a common fraction and a decimal fraction.
- Compare the numbers in the Fraction of Sample column. Are the numbers similar? Did the sample size affect the ratio of tagged beans in the sample?
- If the ratios are all similar, what will a graph of the data look like?