1. Take out your homework # 9.
Inquiry: How do I design a controlled experiment? (identifying variables, controls and experimental groups)
Take out your homework # 9.
Leave it on the table so we can come around and check it.
You will be using that homework for today’s lesson.--

2. Variable Independ. Depend. Constant
Inquiry: How do I design a controlled experiment? (identifying variables, controls and experimental groups)
1) How is the height of a plant affected by the amount of water it receives?
Variable Independ Depend Constant
1) Am’t of sunlight [ ] [ ] [ ]
2) Type of plant [ ] [ ] [ ]
3)Final height of plant [ ] [ ] [ ]
4)Am’t of water it receives [ ] [ ] [ ]
5)Temperature of the water[ ] [ ] [ ]

3. 1) Hypothesis: If trees have leaves, then birds nests will increase.
Inquiry: How do I design a controlled experiment? (identifying variables)
1) Hypothesis: If trees have leaves, then birds nests will increase.
Problem: What affect trees with leaves (independent),
have on the amount of bird nests? (dependent)?
Independent variable: trees with leaves .
Dependent variable: birds nests.
Affects
Depends on

4. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
2) Hypothesis: If chocolate is given to teachers, then amount of homework will decrease.
Problem: What affect will giving chocolates (independent),
have on the amount of homework teachers give? (dependent)?
Independent variable: chocolates .
Dependent variable: homework teachers
give.
Affects
Depends on

5. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
3) Hypothesis: If plants are watered, then growth height will increase.
Problem: What affect will watering plants (independent),
have on the height the plant grows? (dependent)?
Independent variable: watering plant.
Dependent variable: height plant grows.
Affects
Depends on

6. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
4) Hypothesis: If acid rain is in water, then fish population will decrease.
Problem: What affect will acid rain in water (independent),
have on fish population? (dependent)?
Independent variable: acid rain in water.
Dependent variable: fish population.
Affects
Depends on

7. 5) Hypothesis: If calcium is given, then bone strength will increase.
Inquiry: How do I design a controlled experiment? (identifying variables)
5) Hypothesis: If calcium is given, then bone strength will increase.
Problem: What affect will calcium (independent),
have on bone strength? (dependent)?
Independent variable: calcium.
Dependent variable: bone strength.
Affects
Depends on

8. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
1) Problem: What effect does high temperature have on radish germination?
If I change the temperature by increasing it (independent),
what affect will it have on radish germination (dependent)?
Hypothesis: If I change the temperature by increasing it (independent),
then radish germination will increase (dependent).
Independent variable: the temperature.
Dependent variable: radish germination.
Affects
Depends on

9. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
2) Problem: What effect does studying with music have on student test scores?
If I change how I study by studying with music (independent),
what affect will it have on student test scores (dependent)?
Hypothesis: If I study with music (independent),
then my test scores will increase (dependent).
Independent variable: the music.
Dependent variable: test scores.
Affects
Depends on

10. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
3) Problem: What effect does food coloring have on the amount of food fish eat?
If I add food coloring (independent),
what affect will it have on the amount fish eat (dependent)?
Hypothesis: If food coloring is added (independent),
then the amount that fish eat will decrease (dependent).
Independent variable: the food coloring.
Dependent variable: the amount fish eat.
Affects
Depends on

11. 4) Problem: What effect does light have on plant growth?
Inquiry: How do I design a controlled experiment? (identifying variables)
4) Problem: What effect does light have on plant growth?
If I change the amount of light (independent),
what affect will it have on plant growth (dependent)?
Hypothesis: If the amount of light is increased (independent),
then plant growth will increase (dependent).
Independent variable: the light.
Dependent variable: plant growth.
Affects
Depends on

12. Inquiry: How do I design a controlled experiment
Inquiry: How do I design a controlled experiment? (identifying variables)
5) Problem: What effect does smiling have on teacher giving no homework?
If I change how the amount that I smile (independent),
what affect will it have on teacher giving no homework (dependent)?
Hypothesis: If I smile more (independent),
then the teacher will still give homework (dependent).
Independent variable: smiling.
Dependent variable: teacher giving
homework.
Affects
Depends on