Download NOTES: Controlled Experiments

Controlled Experiments
This slideshow is a review.
As you watch it, write down the terms and
definitions in your Journal. The title should be
Notes: Controlled Experiments.
YOU DO NOT HAVE TO WRITE
ANYTHING ELSE! (But please watch it all!)
Variables
Variable
• any factor that can change
or be changed in an
experiment!
examples
• temperature, time, size,
mass, methodology, etc.
In a controlled
experiment, how
many variables
can be changed
at a time?
Only
ONE!!!
Types of variables
Independent variable:
Dependent variable:
•
the one factor the
experimenter changes
(the one that is being tested, or
INVESTIGATED)
•
the one that is measured to
find the results, or DATA
Constants
• Anything else that
can affect the
outcome must
remain the same, or
constant.
The
independent
and dependent
variables
can be found in
the Hypothesis
IF the independent
variable is changed like
this, THEN the
dependent variable will
change like that.
Example
• If a plant is grown in the
presence of music, then it
will grow taller than a
plant grown without
music.
Identify the variables:
Independent variable:
•
The music
Dependent variable:
•
Height of plants
Identify Constants
music
No music
• Amount of
sunlight
• Temperature
• Amount of
water
• Type of soil
• Type of plant
Do you have any questions?
If you do,
please write
them down so
you can
remember to
ask in class
tomorrow.