1. Variables
Obj 1:a-b

2. Variables Variables are factors that may change during an experiment
Several trials should be conducted with only one variable being changed through all of the trials
Independent variable is the variable being changed
There should only be one independent variable being changed during an experiment

3. Variables (cont)
Dependent variable is a variable that changes in response to the change in the independent variable
Control variable is a variable that is being kept constant between the trials
Control experiment is the experiment that you compare your results to so you can measure the change in the dependent variable

4. Identifying variables
Lemon trees receiving the most water produce the largest lemons.
Write a hypothesis/claim.
Identify the independent variable:
Identify the dependent variable:
List 2 possible constants:
Explain what you might use for a control experiment.

5. Identifying variables (cont)
The temperature of water is measured at different depths in a lake
Write a hypothesis/claim.
Identify the independent variable:
Identify the dependent variable:
List 2 possible constants: