More fish would be visible at the location where the water sample was obtained if the amount of dissolved oxygen in the water was higher.
In order to obtain a more accurate result, my experimental strategy would involve testing several water locations at various times throughout a number of intervals of time.
The dependent variable is the number of fish, while the independent variable is the concentration of dissolved oxygen (ppm).
The experiment's control would have the same temperature, the same quantity of fish food, the same level of light, and the same body of water. The appropriate graph for the data set is line graph because it helps to show the growth in some observed with the increase dissolved oxygen.
Horizontal scale = 1 box = 10 units (ppm)
Based on the graph, the number of fish increased with the rise in dissolved oxygen in water up a certain level, then decline slightly before starting to rise again. In the graph, the number of fish grew from 0-15 as oxygen increased from 0-12. However, further increase in the level of oxygen from 12 to 14 resulted in declining in the number of fish to 10 before it the number began to increase again to 13
Exercise 2: Experimental Variables (20 points)
1.
Questions about this observation:
Your response to this part of the question:
Independent variable:
Different sized aquariums
Dependent variable:
Number of fish that survived after six months
Controlled variables/constants:
Temperature of water, amount of food, maintaining and cleaning the aquariums
Experimental controls/control groups:
Not applicable
2.
Questions about this observation:
Your response to this part of the question:
a. Independent variable:
Type of agar
b. Dependent variable:
Amount of bacterial growth,
c. Controlled variables/constants:
Shape and size of Petri dishes and Volume of agar
d. Experimental controls/control groups:
Positive control: Petri dishes with nutrient agar with E. coli
Negative control: Petri dishes with nutrient agar but no E. coli
Exercise 3: Testable Observations (24 points)
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No?
Yes
Is the observation qualitative or quantitative?
Quantitative Hypothesis
Write a hypothesis and null hypothesis
Hypothesis: A plant on the window receives vital nutrients from the direct sunlight
Null hypothesis: Sunlight does not have direct effect on plant growth
What would be your experimental approach?
I would put a plant on the coffee table and another of the same size, condition, and species on the window sill. Both of these pants would be in the same sized pot and soil type where I will water them each day for three days and observe the outcomes
. Controlled variables would be. There are no negative controls. The positive controls would be that the plant in the sunlight receives nutrients through photosynthesis. I would collect my data through measuring the plant's growth daily
What are the dependent and independent variables?
Dependent variable: plant growth
Independent: amount of sunlight each plant is receiving
What is your positive control and what is your negative control?
Positive controls variables: type of soil, the amount of water, the size of the pot and plant condition.
Negative control variables: Not applicable
How will you collect your data?
I would collect the data by taking notes on the qualitative and quantitative features of the plants that grow on the coffee table and window sill.
How will you present your data (charts, graphs, types)?
I would present my data using line graph because it helps to show the correlations between sunlight and plant growth clearly.
How will you analyze your data?
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No?
Yes
Is the observation qualitative or quantitative?
Qualitative
Write a hypothesis and null hypothesis
Hypothesis: Brown hair and eyed teller is taller than other tellers.
Null Hypothesis: The teller with brown hair and brown eyes is not taller than other tellers
What would be your experimental approach?
I would take the height of tellers with a brown eye and brown hair and the heights of other tellers.
What are the dependent and independent variables?
Independent variable: qualitative attribute of tellers
Dependent variables: the heights of tellers.
What is your positive control and what is your negative control?
Individuals who are not tellers.
How will you collect your data?
Observe heights and record the values
How will you present your data (charts, graphs, types)?
I could use bar graph to represent the data with each bar being individual teller and the x- axis being the heights in inches
How will you analyze your data?
Calculate the graphs and compare the results
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No
Yes
Is the observation qualitative or quantitative?
Quantitative observation
Write a hypothesis and null hypothesis
Hypothesis: Sally blood pressure is lower when she eats healthy food than when she eats fatty foods.
Null Hypothesis: there is no difference in Sally blood pressure when she eats healthy food and when she eats fatty foods.
What would be your experimental approach?
I would take two for day experiment. I would let Sally eat fatty foods for two days and then let her eat healthy food in the next two da. In each case, I would measure her blood pressure.
What are the dependent and independent variables?
Independent variable: amount of fatty / healthy food
Dependent variable: Blood pressure
What is your positive control and what is your negative control?
Positive control: Blood pressure before injecting any food and previous blood pressures
Negative control: not applicable
How will you collect your data?
Observing and recording blood pressure when each food type is ingested.
How will you present your data (charts, graphs, types)?
I could use a pie chart to present the data. In each case, I would use different color to represent each food type
How will you analyze your data?
I would calculate the graph and compare the data I have obtained in each food ingested.
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No?
No
Is the observation qualitative or quantitative?
Write a hypothesis and null hypothesis
What would be your experimental approach?
What are the dependent and independent variables?
What is your positive control and what is your negative control?
How will you collect your data?
How will you present your data (charts, graphs, types)?
How will you analyze your data?
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No?
No
Is the observation qualitative or quantitative?
Write a hypothesis and null hypothesis
What would be your experimental approach?
What are the dependent and independent variables?
What is your positive control and what is your negative control?
How will you collect your data?
How will you present your data (charts, graphs, types)?
How will you analyze your data?
Questions about this observation:
Your answer to the question:
Could this observation lead to a testable hypothesis – Yes or No?
No
Is the observation qualitative or quantitative?
Write a hypothesis and null hypothesis
What would be your experimental approach?
What are the dependent and independent variables?
What is your positive control and what is your negative control?
How will you collect your data?
How will you present your data (charts, graphs, types)?
How will you analyze your data?
Exercise 4: Conversion. (16 points)
1.
46,756,790 mg =
46.76
kg
2.
5.6 hours =
20,160
seconds
3.
13.5 cm =
5.31
inches
4.
47°C =
116.6
°F
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