Submitted by: Submitted by kreynolds
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Category: Other Topics
Date Submitted: 07/08/2014 12:33 PM
Exercise 1:
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since virtually every living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measure in units of ppm—or parts per million. Examine the data in Table 2 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below.
Table 2: Water quality vs. fish population
Dissolved Oxygen (ppm) |0 |2 |4 |6 |8 |10 |12 |14 |16 |18 | |Number of Fish Observed |0 |1 |3 |10 |12 |13 |15 |10 |12 |13 | |
1. Based on the information in Table 2, what patterns do you observe?
The amount of dissolved oxygen increases as the number of fish increases.
2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.
When the number of fish increases, the dissolved oxygen increases as well.
3. What would your experimental approach be to test this hypothesis?
Conduct additional measurements with numbers of fish that aren’t already recorded (for example measure oxygen for 6 fish, 8 fish, 16 fish)
4. What are the independent and dependent variables?
Independent – Number of fish
Dependent – Dissolved Oxygen
5. What would be your control?
The control would be the body of water.
6. What type of graph would be appropriate for this data set? Why?
Scatter because it clearly shows the increase with the number of fish and oxygen.
7. Graph the data from the table above.
[pic]
8. Interpret the data from the graph made in Question 7.
The more fish, the more dissolved oxygen.