Hypothesis

Hypothesis: An educated guess
What you think will happen based on the
science you know.
 If I put Alka Seltzer in warm water, it will
dissolve faster than room temperature water.
 If I roll a large ball down a hill, it will go faster
than a small ball.

Independent Variable

Independent Variable: the variable you
have control over, what you can choose
and manipulate. It’s what you want to see
the effect of.

The effect of calcium chloride crystals in a
dissicator on the amount of rust of an iron
nail.
Dependent Variable

Dependent Variable: what you measure.
The variable changes or responds to the
independent variable.

The effect of temperature on mold growth on
white bread.
Control

the variable is what you compare the
independent variable to. It is the same
type of substance or condition. It may be
the normal condition.
Control Variable

The effect of warm water on the rate that an
Alka Seltzer tablet dissolves.

The effect of diameter on the speed a ball
rolls down a hill.

The effect of temperature on mold growth on
white bread.
Constants

Variables other than independent and
responding that are kept the same so the
only change is due to the independent
variable.
Constants

The effect of warm water on the rate that an
Alka Seltzer tablet dissolves.

The effect of diameter on the speed a ball
rolls down a hill.

The effect of temperature on mold growth on
white bread.
Trials or Replications

Doing the experiment several times to
reduce errors.
Materials and Methods or
Procedures

Materials: the items used in the experiment

Method or Procedure: step by step
instructions on how to do the experiment
All of the materials should also be in the
method/procedure.

Data Table
Tables: Title that includes IV and DV.
 Place DV in columns and include units.
Divide into Trials. Rows list IV.

Change in height of Solanum lycopersicum
due to nitrogen fertilizer
N grams
Height of plants (cm)
Avg
0
6.5
5.4
5.2
17.1
1.0
12.5
12.0
12.4
12.3
2.0
15.2
16.0
15.8
14.8
Graphs

Place IV on X axis and DV on Y axis
 (Y to the sky).
Conclusions
1.
-
3 parts
Conclusion: What happened? Write
about your numbers in paragraphs to
tell how the IV affected the DV
compared to the control.
Part 2: Evaluation
2. Evaluation: Why? Discuss the science of
why the results turned out how they did.
You may need to go online for more info.
This is also where you discuss how your
method or plan could have affected the
results.
 Where mistakes were made. (Sources of
error.) *Never blame your equipment!
Part 3: Modifications
3. Modifications:
a. What could you do to fix problems or
improve your results next time?
b. What would be another IV you could
test or a similar experiment that you
could conduct?
Design an experiment
IV
 DV
 Control
 3 Constants

Does the wavelength of light
(ROYGBIV) affect a plant’s growth?
Design an experiment
 IV
 DV
 Control
 3 Constants
 Materials
 Method

Does Rogain really improve hair
growth?
Design an experiment
 IV
 DV
 Control
 3 Constants
 Materials
 Method
