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

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