1. Experimental Design

2. Words to Know… Hypothesis: drives the experiment
and gives it direction
Hypothesis: proposed explanation made on the basis of limited evidence as a
starting point
for further
investigation

3. …It Varies… Fertilizer Independent Variable (IV): It is
The variable that you are changing
therefore manipulating
Fertilizer

4. …It Varies Height Dependent Variable (DV):
It is the variable that you are measuring, that responds to IV
Height

5. …It Varies… Water Control Variable: allows you to see the
true impact of the
independent variable
on the dependent
Control Variable: any
variable or variables
that are constant or
unchanged in an
experiment
Water

6. >It’s what you’re controlling<
…It Varies…
Independent Variable:  It is a
variable that stands alone and
isn't changed by the other variables 
you are trying to measure.
>It’s what you’re controlling<

7. It’s Rocket Science

8. Educated Guess Hypothesis: If I use fishing line for
one rocket and yarn for the other,
then the one on the fishing line will
go further because there
will be less friction.

9. >It’s what you’re controlling<
…It Varies…
String
Independent Variable:  It is a
variable that stands alone and
isn't changed by the other variables 
you are trying to measure.
>It’s what you’re controlling<
Distance

10. Important It is either supported or not supported by the data.
A Hypothesis is NEVER right  
or wrong!!! 
It is either supported
or not supported by
the data.

11. If I drink more milk then my bones will be stronger because of the
If I drink more milk then my bones
will be stronger because of the
vitamins and minerals in it.
IV = ?
DV = ?