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.
First, are you talking about live fish?
If so, the level of oxygen needs to be great enough for the needs of these fish. Also the sizes of the fish would effect the amount of oxygen needed.
To develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed, you'll need to consider the relationship between these two variables. A hypothesis is a specific statement that proposes a cause-and-effect relationship between variables. In this case, you might think about how the availability of dissolved oxygen affects the survival or thriving of fish populations in the body of water.
Here's an example of a hypothesis that you could develop:
Hypothesis: The higher the amount of dissolved oxygen in the water sample, the greater the number of fish observed in the body of water.
To test this hypothesis, you would need to collect data on the amount of dissolved oxygen in different water samples and correlate it with the number of fish observed in each corresponding body of water. By analyzing the data, you can determine if there is a relationship between dissolved oxygen levels and fish population.