Hypothesis
H0: An increase in dissolved oxygen increases the fish population
H1: An increase in dissolved oxygen does not increase the fish population
Explanation
An increase in the dissolved oxygen (PPM) causes a corresponding in increasing the fish population. When the oxygen is zero, it is possible to have no fish in the population. Dissolving more oxygen in water increases the number of present fish; thus, the positive influence of the oxygen on the fish population. In spite of this, it is ideal to note the potentiality of the number of fish in the population to drop off when the volume of oxygen reaches a specific level.
The hypothesis has a critical role in designing experimental research by offering the desired approach for relating independent and dependent variables. It is possible to come up with diverse hypotheses related to the water quality and fish population. First, the amount or volume of the dissolved oxygen tends to affect the fish population living in a water body. Second, it is possible to come up with the hypothesis that fish can only live in an ideal dissolved oxygen concentration. Third, an increase in the dissolved oxygen concentration leads to an increase in the fish population. Finally, there is direct interaction or correlation between the fish population in water and the level of the dissolved oxygen in the water.
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In testing these hypotheses, it is vital to consider taking water samples to facilitate the measurement of the dissolved oxygen in the taken sample. In the next step, the experiment will consider assessing or measuring the fish, population against the water quality as identified in the samples. In such an experimental approach, the dissolved oxygen will be the independent variable, with the fish population becoming the dependent variable. The approach will be adequate and appropriate in creating room for the assessment or confirmation of the hypotheses.
