1. What To Do…
Open your binder to the inquiry and engineering table of contents.
Have a pencil ready
We are getting some papers back today!

2. Before we Begin…
Quiz tomorrow! (will be over tools, scientific method, graphs, bias, experiments, models…)
We need egg cartons!!!! Not the cardboard kind please.

3. What To Do… Open your manuals to page 15.
Answer the following question in the Think About It… What is the difference between qualitative data and quantitative data?

4. Controlled Experiments
Standards:
Inq.1 - Design a simple experimental procedure with an identified control and appropriate variables.
Inq.2 - Select tools and procedures needed to conduct a moderately complex experiment.

5. After the video clip, identify these questions on a scratch sheet of paper… 1)what is being measured? 2) what are the variables?

7. Video Response: 1) What is being measured? 2) What are the variables?
The ability of the cans of soda to float or sink.
Independent: Amount of sugar in the soda
Dependent: Ability of the can to float or sink
Controls: Size of can, amount of soda in the can, the water container, the type of water, the person putting the cans into the water

8. Variables Examples of variables: -Temperature -Light
A factor that CAN CHANGE. Some variables will cause other factors to change also.
Examples of variables:
-Temperature
-Light
- Open vs. Closed container
-Location
-Time
-Elevation
-Pressure

9. A Quantitative Variable is one that is measured using numbers
Examples: temperature is measured in degrees, length can be measured in centimeters.

10. Qualitative
A Qualitative variable is one that is measured by its qualities.
Examples: bright, dull, clear, rough, smooth, plain

11. What do you Think? 1. Qualitative? a. Measures using numbers
b. Measures by length
c. Measures by it’s qualities
2. Quantitative?
a. Measures using numbers
b. Measures by length
c. Measures by it’s qualities

12. Controls
The CONTROLS in an experiment are all the factors that the experimenter attempts to keep constant or the same in all groups
Keeping a constant will ensure that all trials of an investigation were equally impacted by the variable; therefore, allowing one to see the impact of an independent variable on the dependent variable.

13. Control Group
In a scientific experiment, the control group is the standard of comparison to see if the independent variable has any effect.

14. Control Group
The control group may be a “no treatment” or an “experimenter selected” group
The control group is exposed to the same conditions as the experimental group, EXCEPT for the variable being tested.
In a controlled experiment only ONE variable is allowed to change at a time.
All experiments should have a control group

15. What do you Think? 1. The control group serves as…?
The independent variable
The standard for comparison
The dependent variable
2. The control(s) is/are always?
Changed
Measured
Constant

16. Experimental Group
The group that will receive the independent variable stimulus
The group that is being tested

17. Independent Variables vs.
Independent variable: the variable that you change or that you WANT to test.
Dependent variable: The variable that changes BECAUSE of the independent variable
In other words, the independent variable is the cause and the dependent variable is the effect.

19. What do you Think?
1. This is the group being tested? a. Music group b. Control group c. Experimental group
2. The independent variable is the one that…?
Is changed
Is measured
Is free to do what it wants

20. Y Graphing Variables X dependent independent
The Independent variable is always graphed on the X axis.
The dependent variable is always graphed on the Y axis. Y
dependent X
independent

21. QUESTION INDEPENDENT VARIABLE (What I change) DEPENDENT VARIABLE
(What I observe)
CONTROLLED VARIABLE
(Kept the same)
How much water flows through a faucet at different openings?
Water faucet opening (closed, half open, fully open)
Amount of water flowing measured in liters per minute
The Faucet
Water pressure, or how much the water is "pushing"
Does heating a cup of water allow it to dissolve more sugar?
Temperature of the water measured in degrees
Amount of sugar that dissolves completely measured in grams
Stirring
Type of sugar

22. DO!
Find the independent, dependent, and controls from the given experiment.
Students want to determine which type of plant will best survive in a hot, dry environment. They place 4 different types of plants in identical pots. They put all 4 plants by the same large window. They give each plant the same amount of water every day.
Independent variable: __________________________________
Dependent variable: __________________________________
Controls: _______________________________________________________
Type of plant
Plant growth
Amount and type of water, amount and type of soil, location, window, sunlight exposure, pot

23. Keys to Understanding At LEAST 5 complete sentences
Summarize the main points of the lesson
Describe in detail the important ideas
Write about concepts you want to remember
This should be helpful to YOU!