Transcript variable - ALP Math and Science with Kerri

Hypothesis and
Variables
Form a Hypothesis

Hypothesis- a testable explanation of an
observation.

A hypothesis is NOT just an educated
guess about what you think will happen. It
must be able to be tested!
Form a Hypothesis

We write the hypothesis in an If-Then
statement
ex: If the amount of fertilizer is
increased, then the height of the plant
will increase.
Variables & Controls

A variable is anything that changes in a
scientific experiment.

The control is what you use to compare
the results to in the end of the experiment.
There are 2 types of variables:
Independent
 Dependent

Form a Hypothesis

The Independent Variable goes after the “If”
I.V.
If the amount of fertilizer is increased,
then the height of the plant will increase.
Form a Hypothesis

The Dependent Variable goes after the “Then”
If the amount of fertilizer is increased,
then the height of the plant will increase.
D.V.
Now You Try:

If you spend more time studying, then your
grade will improve.
Independent Variable =
 Dependent Variable =

Now You Try:

If you spend more time studying, then your
grade will improve.
Independent Variable = amount of time
spent studying
 Dependent Variable = grade

Now You Try:

If the temperature of the room is increased,
then the bacteria will grow faster.
Independent Variable =
 Dependent Variable =

Now You Try:

If the temperature of the room is increased,
then the bacteria will grow faster.
Independent Variable = temperature of room
 Dependent Variable = bacterial growth

Variables & Controls

A variable is anything that changes in a
scientific experiment.

The control is what you use to compare
the results to in the end of the experiment.
2 Types of variables:

Independent Variable: What you
change.

Dependent Variable: What changes
because of the Independent Variable.
2 Types of variables:

Independent Variable: Cause

Dependent Variable: Effect
Independent Variable

Independent Variable: What you
change.
 Cause
 a.k.a Manipulated Variable
 Graphed on x axis
Dependent Variable

Dependent Variable: What changes
because of the Independent Variable.
Effect
a.k.a Responding Variable
Graphed on y axis
Independent Variable vs.
Dependent Variable
Independent
Variable
Also Known
As:
Manipulated
Variable
Dependent
Variable
Responding
Variable
Results:
Cause
Effect
On a graph:
X axis
Y axis
After all of the data from the
experiment is collected, then its
time to organize the data.
Organize your data

Put your data into a data table
Independent
Variable
__________(unit)
Levels
Dependent Variable _______________ (unit)
Trial 1
Trail 2
Trail 3
mean range
Organize your data

Make the data table into a graph

GRAPHS make it EASIER to see
patterns in the data!
Organize your data
 How
do you know what goes on each
axis of the graph?
Organize your data

DRY MIX
 Dependent
Variable = Responding Variable = Y axis
 Manipulated Variable = Independent Variable = X axis
Parts of a graph
Y Axis
X Axis
Parts of a graph
Y Axis (Dependent
Variable)
X Axis
(Independent
Variable)
Dependent Variable
Graphing: DRY MIX
Independent Variable
Any Questions????