1. Get Ready! Materials Today’s Agenda 5-in-5 Go over Quick Check
Control & Experimental Groups Notes
Practice
Pencil
Homework
Notebook

2. Trout raised in cold water weigh more than trout raised in warm water.
5-in-5 Bellwork #8
Trout raised in cold water weigh more than trout raised in warm water.
Part 1: Identify the independent, dependent and controlled variables in this experiment. Part 2: Write a hypothesis for this experiment.

3. Go over Quick Check

4. I will…
identify the control and experimental group in a controlled experiment
Understand the purpose of a control group

5. Control and Experimental Groups

6. Conducting a CONTROLLED Experiment
An Experimental Group will be the group:
with the independent variable
this is the group that is being tested!
A Control Group will be the group:
without the independent variable OR
the “normal” conditions

7. Example: Plants that are grown with fertilizer will grow taller.
Experimental Group
Control Group
Go over example with a plant and fertilizer.

8. Purpose of a Control Group
The control group is used as a COMPARISON to the experimental group
It helps scientists see the impact the independent variable had on the dependent variable.

9. Set up your whiteboard! Independent Variable: Dependent Variable:
Control Group:
Experimental Group:
Set up your whiteboard!

10. Walking 10,000 steps a day will lower blood pressure.
IV: number of steps taken each day DV: blood pressure Control Group: group walking less than 10,000 steps per day Experimental Group: group walking more than 10,000 steps per day

11. Hamsters raised on a taco diet have less heart disease than hamsters raised on Purina Hamster Chow.
IV: type of diet
DV: heart disease
Control Group: group of hamsters fed hamster chow
Experimental Group: group of hamsters fed tacos

12. Exercise cuts the risk of catching colds.
IV: amount of exercising DV: catching a cold Control Group: group of people that do not exercise Experimental Group: group of people that do exercise

13. Practice Worksheet