## [solution]: Dissolved oxygen is oxygen that is trapped in a fluid, such as

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Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organism 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?or parts per million. Examine the data in Table 4 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below.

Table 4: Water Quality vs. Fish Population
Dissolved Oxygen (ppm)024681012141618
Number of Fish Observed01310121315101213

Exercise 2: Testable Observations

Determine which of the following observations are testable. For those that are testable, answer the following:

What is your hypothesis and null hypothesis?

What would be your experimental approach?

What are the dependent and independent variables?

What are your controls - both positive and negative?

1. A plant grows three inches faster per day when placed on a window sill than it does when placed on a coffee table in the middle of the living room.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

2. The teller at the bank with brown hair and brown eyes is taller than the other tellers.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

3. When Sally eats healthy foods and exercises regularly, her blood pressure is 10 points lower than when she does not exercise and eats fatty foods.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

4. The Italian restaurant across the street closes at 9PM but the one two blocks away closes at 10PM.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

5. For the past two days, the clouds have come out at 3PM and it has started raining at 3:15PM.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

6. Ice cream melts faster on a warm summer day than a cool winter day.

Testable?-

Hypothesis-

Null Hypothesis-

Experimental Approach-

Dependent Variable-

Independent Variable-

Positive Control-

Negative Control-

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