Exercise 1: Data Interpretation
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organisms 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 measured in units of ppm (parts per million). A researcher has found ten bodies of water with incrementally increasing dissolved oxygen and decides to use these to examine the effect dissolved oxygen has on a certain population of fish. She visits these sites multiple times and records the number of fish she observes each time. The data in Table 4 shows the amount of dissolved oxygen present and the average number of fish observed. Use this data to answer the questions below.

Post-Lab Questions

  1. What patterns do you observe based on the information in Table 4?
  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.
  3. What would your experimental approach be to test this hypothesis?
  4. What would be the independent and dependent variables?
  5. What would be your control?
  6. What type of graph would be appropriate for this data set? Why?
  7. Graph the data from Table 4: Water Quality vs. Fish Population (found at the beginning of this exercise).
  8. Interpret the data from the graph made in Question 7.

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