Question

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	1 2	13	15	10	12	13

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?

PLEASE TYPE ANSWERS

Answer 1

Answer-1 The pattern observed in the table is discrete pattern.

Answer-2 The hypothesis will be as follows-

The number of fishes observed in a water sample is independent from the dissolved oxygen level.

Answer-3 The hypothesis can be tested by detecting dissolved oxygen levels of different water bodies and the number of fish in that particular water body.

Answer-4 the independent variable will be number of fishes and concentration of dissolved oxygen there will be no dependent variable.

Answer-5 control sample will be the previous data available for the number of fishes in a specific dissolved oxygen level.