I-N-D-E-P-E-N-D-E-N-T variables (and dependent and controls) Objectives: SWBAT identify independent and dependent variables in a controlled experiment. Catalyst: Write a hypothesis to the following question. Then describe how you would answer it. Would a tomato plant grow larger in natural light or artificial light?

Agenda Catalyst Review How to work in Mr. Jhaveri’s lab Make mystery goo! What is an independent and dependent variable? FOLDABLE Exit Question

Catalyst Review Hypotheses! Is it educated? Is it testable? How would you test it? What are you changing? What are you keeping the same? This might be the time that you want to push your kids to bring details of their experiment. Same seeds, same soil, same pot, things like this as an “anticipatory set” for the lesson. Oooh.

Mystery goo! (30 minutes) Once you have your procedure ready to go: Gather the materials you need. Send logistics person to go get it. With your group, ANTICIPATE what will happen Clean up: Beakers must be washed thoroughly. Place them upside down on the paper towels. Wipe down your desks and floors.

Mystery Goo Hypotheses Let’s talk about the goo some more. What would have happened if we added more water? How would you test it? What would have happened if we added more corn starch? How would you test it?

Experimentation Key Point #1: A proper experiment always has an independent variable, dependent variable, and control group. Scientists will change one thing and measure something else. If Mr. Jhaveri wears his basketball shoes, then he will score more points in a game. Bring em in. We discussed making observations, questions (kinda), making hypotheses, lets discuss how we test our guesses to questions.

Variables Independent Variable: The thing that I change Basketball Shoes Dependent variable: The thing that is measured Points *Remember variables are always nouns!! Ask your students, what was the thing I changed? What did I measure?

Good experiments… IMPORTANT!!! ONLY CHANGE 1 THING!! You must keep everything else constant, or your data may not be valid! Control Group: The group without the independent variable. What was the control group in the basketball experiment? Introduce web technique. IMPORTANT!!!

Practice Do older microwaves give off more radiation? What is the independent variable? IV = DV = Microwave Age Radiation

Practice Are there more love bugs in the summer or the winter months? What is the dependent variable? IV = DV = Season Amount of love bugs

Practice Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. What was the dependent variable in this experiment? IV = DV = Age Puzzle Assembly Time

If there are more students, then there will be more school buses. IV = DV = Amount of students Number of school buses

If the cost of beignets increases, then fewer will be sold. What depends on what? IV = DV = Cost of Beignets Amount of Beignets sold If the cost of beignets increases, then fewer will be sold.

If the Saints sign more free agents, then they will win more games. IV = Number of free agents DV = Games Won

Foldables! First flap: Real-life scenario in hypothesis form Second Flap: Define and identify independent variable Third Flap: Define and identify dependent variable Fourth Flap: Define and identify control group

Exit Question Identify the independent variable, dependent variable, and control group in the following scenario. Dr. Ayaad believes that eating artichokes can decrease cholesterol. Dr. Ayaad recruited two sets of patients of equal age and health and she gave one group a normal diet and another an artichoke- filled diet. She then measured the patient’s cholesterol 2 weeks later.

COMPUTER TIME One computer per 2 students. Respect these computers. Always tie up cords before walking. Do not use excessive force when opening up the computer. Be Patient!!! Respect the time. If I see you on another website without permission, you lose your computer privileges for the day and you will have an alternative assignment. Alternative assignment=worksheet! Suckas.

After you get your computer running… Go to this website: http://school.discoveryeducation.com/sciencefaircen tral/ On the brown tabs on the lower left, click virtual lab. Then, hit get started. Click How Does Your Garden Grow Virtual Lab (Flash) Segue into teacher demo: Let’s ask the question.

Practice Do older microwaves give off more radiation? What is the independent variable? IV = DV =

Practice Are there more love bugs in the summer or the winter months?” What is the dependent variable? IV = DV =

Practice Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. What was the dependent variable in this experiment? IV = DV =

If there are more students, then there will be more school buses. IV = DV =

What depends on what? IV = DV = If we increase the cost of beignets increases, then fewer will be sold.

If the Saints sign more free agents, then they will win more games. IV= DV=