Transcript Hypothesis & Variables Powerpoint
HYPOTHESIS AND VARIABLES
Step 3: 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!
Step 3: Form a Hypothesis We write the hypothesis in an
If-Then statement
ex:
If
the amount of fertilizer is
then
the height of the plant increased, 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
Step 3: 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.
Step 3: 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 = studying amount of time spent 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
Also Known As: Results: Independent Variable
Manipulated Variable Cause
Dependent Variable
Responding Variable 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.
Step 6: 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
Step 6: Organize your data Make the data table into a graph
GRAPHS make it EASIER to see patterns in the data!
Step 6: Organize your data How do you know what goes on each
axis
of the graph?
Step 6: 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)
Graphing: DRY MIX
Independent Variable
Any Questions????