Vocabulary
Control Group & Hypothesis
Independent & Dependent Variables
Graphing
Random
100
Define Hypothesis
An educated guess or prediction
100
Define Control group.
A control group is an element that is not changed throughout an experiment.
100
The one factor that a scientist changes during an experiment.
Independent Variable
100
What kind of graph is this?
Bar Graph
100
An experiment is carried out to determine how different pH values of soil will affect the growth of tomato plants. In this experiment, the dependent variable could be the
height of the tomato plants
200
Information that supports or contradicts a hypothesis. (Hint: Proof)
Evidence
200
Create a hypothesis.
Do you think that talking to your plants every day will make them grow more?
I do/don't think that talking to your plants every day will make their increase/decrease height because ___________.
200
The higher the temperature of the water, the faster the egg will boil.
Identify the independent and dependent variables.
IV: Temperature
DV: Time
200
What are 3 things you need to include on a graph?
Title, Scale, Axes Labels, Data Points, etc.
200
How can you improve your experiment?
Repeat trials, etc.
300
Define observation
Using your 5 senses to gather information
300
Using the hypothesis:
If acid rain is in water, then the fish population will increase.
Identify the IV and DV.
IV: Acid rain amount
DV: Fish population
300
You water three sunflower plants with saltwater. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.
Identify the IV and DV
IV: Concentration of salt
DV: Height
300
True or false?
Your scale has to have a consistent interval.
True! Your scale should go up by 1s, 2s, 5s, 10s, 20s, etc.
300
In a controlled experiment, how many independent variables can be tested at one time?
Only 1!
400
A scientific procedure that tests a hypothesis.
Experiment
400
What things do you need to include when creating a hypothesis?
Independent Variable, Dependent Variable, & Reason
If IV... then DV.... because...
400
Research Question: Do tomatoes grow fastest under fluorescent, incandescent, or natural light?
What are the independent and dependent variables?
IV: Light Source
DV: Tomato Plant Height
400
The independent variable goes on the ____ axis.
X-axis
400
Conclusions based on an experiment are most likely to be accepted when
1) they are observed with experimental data and observations
2)they are derived from investigations having many experimental variables
3) scientists agree that only one hypothesis has been tested
1
500
Define independent variable and dependent variable.
Independent Variable: the thing that changes in the experiment
Dependent Variable: the variable being tested and measured in an experiment
500
You water three sunflower plants with saltwater. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.
What is the CG and hypothesis?
CG: Pure water Plant
Hypothesis: If you increase/decrease the amount of saltwater, then the plant height will increase/decrease because ...
500
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.
What are the independent, dependent variables and control group?
IV: Wing Length
DV: Amount of time it takes for each helicopter to fall to the ground
CG: He drops them the same way from a height of two meters
500
Why are graphs useful?
Visually organize data contained in a table.
Allows you to easily observe trends.
500
True or false?
The purpose of an experiment is to prove the hypothesis true
False, the purpose of an experiment is to test if the hypothesis is true or false