1. Three Kinds of Variables

2. Three Kinds of Variables:
1). MANIPULATED (INDEPENDENT) VARIABLE- It is intentionally manipulated! What we will change is…. What we will change is time

3. Three Kinds of Variables:
2). RESPONDING (DEPENDENT) VARIABLE-
It is affected or responds to the change (the manipulated variable)
What we will measure is ____________
What we will measure is the number
of bacteria

4. Three Kinds of Variables:
3). CONTROL (CONSTANTS)-
It is not changed at all
It is always constant
Ensures fairness
Same type of seed used; Same amount of water given at the same time each day…

5. Remember: A controlled experiment will only change one manipulated variable at a time. All other variables will be kept unchanged!

6. Control Group vs Experimental Group
The experimental group has been manipulated by the independent variable.
The control group always remains constant!