1. ENIVIRONMENTAL SCIENCE
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Experimental Design (ppt) – NB #2
LT: Be able to identify the key concepts to experimental design.

2. -Synthesis of material on the right Notes Ppt Textbook Vocabulary
NOTEBOOK
#2: Experimental Design
#2: Experimental Design
Title on both sides
(left side)
(right side)
-Graphs
-Illustrations
-Diagrams
-Synthesis of material on the right
Creativity/Color/Original work
Notes
Ppt
Textbook
Vocabulary
Assignments
Labs

3. Spring Break
2 Weeks before Christmas
Valentines Day
April Fools Day
Summer Holiday
Christmas Day
Mondays

4. Science – is what you know and the things that you do!
Interpret & Evaluate
Observations
Experiment
Hypothesis
Prediction

5. designing an
experiment

6. A variable is something that changes.

7. 6 concepts of experimental design
independent variable
dependent variable
constants
control group
experimental group
repeated trials

8. the variable that is changed on purpose by the experimenter
independent variable
the variable that is changed on purpose by the experimenter
aka cause, stimulus, reason, manipulated variable, etc.
This is the ‘’if” part of a hypothesis.

9. the variable that responds
dependent variable
the variable that responds
aka effect(s), result(s), responding variable, etc.
This is the ‘’then” part of a hypothesis.

10. all factors which are NOT allowed to change during the experiment
constants
all factors which are NOT allowed to change during the experiment

11. control group the group (standard) to which everything is compared
(often the “normal” condition)

12. the group(s) being tested with the independent variable
experimental group
the group(s) being tested with the independent variable
Each test group has only one factor different from the other test groups: the independent variable.

13. the number of times the experiment is repeated
repeated trials
the number of times the experiment is repeated
The more times you repeat the experiment, the more VALID your results are.

14. IVCDV chart The is used to design an experiment.
Ex: use of different amounts of fertilizer on plant growth

15. iv
constants dv
The variable (factor) that you will change is the independent variable.
fertilizer
This is what you are changing in order to test in the experiment such as the varied fertilizer amounts.
0 drops
2 drops
4 drops
Plants with no fertilizer are the control.
6 drops

16. The dv would be data/ results that you collect in the experiment.iv
constants dv
fertilizer
plant growth
0 drops
The variable (factor) resulting from the independent variable is the dependent variable.
2 drops
4 drops
6 drops
The dv would be data/ results that you collect in the experiment.

17. iv
constants dv
fertilizer
amt. of water
plant growth
type of soil
These are the factors that do NOT change during the experiment. They must remain constant.
0 drops
amt. of soil
2 drops
type of plant
4 drops
type of planter
6 drops
size of planter
type of light
location

18. 4 drops fertilizer
2 drops fertilizer
6 drops fertilizer
no fertilizer

19. EXPERIMENTAL GROUP CONTROL 2 drops fertilizer 4 drops fertilizer
What is this called?
What are these called?
CONTROL
EXPERIMENTAL GROUP
no fertilizer

20. What are these called?
CONSTANTS

21. dependent variable 29” What is this called?
The plant growth that you observe here can be called . . .
 the results (of adding fertilizer)
 the response (to adding fertilizer)
13”
 the effects (of adding fertilizer) 9” 7”
dependent variable 2 4 6 22

22. Fertilizer becomes a constant. Type of soil becomes the IV.
What do you do if you want to test the type of soil instead of fertilizer? iv dv
constants
plant growth
fertilizer
amt. of water
type of plant
type of planter
size of planter
amt. of soil
type of light
location
type of soil
type of soil
fertilizer
Fertilizer becomes a constant.
Type of soil becomes the IV.

23. forming a
hypothesis

24. V Chart

25. If fertilizer is added to plants, then plant growth will improve.iv
constants
amt. of water
type of soil
type of plant
type of planter
size of planter
amt. of soil
type of light
location dv
fertilizer
plant growth
+ verb
+ verb
If fertilizer
is added to plants,
then plant growth
will improve.

26. If independent variable + verb, then dependent variable + verb.
V Chart
Independent Variable
Dependent Variable
+ verb
+ verb
If independent variable + verb,
then dependent variable + verb.
hypothesis

27. Know how to graph data Title the graph
Set up the independent variable along the X axis
Set up the dependent variable along the Y axis
Label each axis and give the appropriate units
Make proportional increments along each axis so the graph is spread out over the entire graph area
Plot points and sketch a curve if needed. Use a straight edge to connect points unless told to extrapolate a line.
Label EACH curve if more than one is plotted.