Introduction to Science.docx - Introduction to Science Exercise 1 Data Interpretation Dissolved oxygen is oxygen that is trapped in a fluid Since many

Introduction to Science.docx - Introduction to Science...

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Introduction to Science Exercise 1: Data Interpretation Dissolved oxygen is oxygen that is trapped in a fluid. Since many living organisms require oxygen to survive, it is a necessary component of water systems (streams, lakes, rivers, etc.). Dissolved oxygen is measured in units of parts per million (ppm). Examine the data in Table 4, which shows the amount of dissolved oxygen present in a body of water and the number of fish observed in the sample. Then, answer the questions below. Table 4: 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. What patterns do you observe based on the information in Table 4? There is a pattern of increased fish seen as the dissolved oxygen also increases, until it reaches its peak at 15 fish to 12 ppm then the number of fish seen drops then increases as the number of dissolved oxygen continues to increase. 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. I believe that there will be a slow increase of fish seen as the dissolved oxygen rises because more and more fish are going to try and seek out the needed oxygen they need to survive which will only be found at the surface. 3. What would your experimental approach be to test this hypothesis? My experiment would consist of three different areas of water: one with a high level of dissolved oxygen, a neutral leveled one, and one with low levels of dissolved oxygen to see how the fish react in each level of dissolved oxygen. ©eScience Labs, 2018
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4. What would be the independent and dependent variables? The independent variable would be the low level of dissolved oxygen and the dependent variable would be the high level of dissolved oxygen. 5. What would be your control? My control would be an area of water with fish that are in a neutral amount of dissolved oxygen. 6. What type of graph would be appropriate for this data set? Why? A line graph, because it is the best way to show the relationship between the variables. ©eScience Labs, 2018
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7. Graph the data from Table 4. 8. Interpret the data from the graph made in question 7. The number of fish seen in the water increases as the dissolved oxygen increases until it reaches 12 ppm. When the concentration gets higher than 12 ppm the dissolved oxygen continues to increase but the number of fish seen seem to go into a decrease to increase repeated pattern. ©eScience Labs, 2018
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Exercise 2: Testable Observations Determine which of the observations below are testable. For those that are testable: Determine if the observation is qualitative or quantitative. Write a hypothesis and a null hypothesis. What would be your experimental approach?
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