1. Agenda Do Now- Sci Meth Rap (4 min) Do Now- Sci Meth Rap (4 min) Announcements (3 min) Announcements (3 min) Types of Variables (12 min) Types of Variables (12 min) Eggs-periment (20 min) Eggs-periment (20 min) Exit Ticket (4 min) Exit Ticket (4 min)

2. Independent, Dependent and Control Variables Bart believes that mice exposed to microwaves will become extra strong (he’s been reading too much Radioactive Man.) He decides to put 10 mice in the microwave for 10 seconds and compare their strength to 10 other mice who had not been put in the microwave. What is the: cause? Effect? Why does he leave some mice out of the microwave?

3. This means we should only change one variable at a time. In any experiment, we must be able to attribute the effect to a cause. All other variables that stay the same are called CONTROLLED VARIABLES.

4. In a good experiment a scientist changes a variable and measures what the effect is. Independent variable: The factor a scientist changes; the cause Independent variable: The factor a scientist changes; the cause Dependent variable: The factor a scientist measures; the effect Dependent variable: The factor a scientist measures; the effect Controlled variable: Factor that stays the same so that results can be determined Controlled variable: Factor that stays the same so that results can be determined

5. Conducting Experiments Vocabulary Review Experiment Variables: A factor that can change in an experiment. Control: What we keep the same in order to make sure it isn’t what’s causing the effect. Dependent Variable: The variable that is affected. Independent Variable: The variable that causes the effect.

6. More Practice: Independent & Dependent Variables 1. 1. Adding salt to water affects the temperature at which it boils. 2. 2. Putting plants under the sunlight will allow them to grow more. 3. 3. Eating too much chocolate gives you cavities. 4. Asking for help when I’m confused will help me understand difficult concepts. 1.Adding Salt; temperature to boil 2.Sunlight how much it grows. 3.Eating chocolate; your cavities. 4.Asking for Help; how well you understand difficult concepts.

7. Testable Questions Testable Question: A question that can be answered by designing and conducting an experiment. Format: What is the effect of _________ on _________? Independent Variable Dependent Variable

8. Which of the following is a good testable question? Why? A. Will our teachers give us homework tonight? B. Why is it always so cold in this room? C. What is the effect of the rolly poly bugs on the weight of my frogs?

9. Example: Bart Bart wants to see if a microwave’s radioactive waves make stronger mice. Independent Variable: Dependent Variable: Testable Question: Control Variable: Microwaves Mice Strength What is the effect of _________ on ___________? mice strength Dependent Variable Type of mouse microwaves Independent Variable

10. Example: Health Coverage Will providing everyone with health care insurance lead to a healthier American population? Independent Variable: Dependent Variable: Testable Question: Control Variable: Health Care Insurance for All Healthier Americans What is the effect of _________ on ___________? American health Dependent Variable Job access, healthy foods available, pollution Insurance for All Independent Variable

11. Example: The Swine Flu Will elbow bumping reduce the rate of the swine flu? Independent Variable: Dependent Variable: Testable Question: Control Variable: Elbow Bumping Rate of the Swine Flu What is the effect of _________ on ___________? Swine Flu Rates Dependent Variable Same locations elbow bumping Independent Variable

12. Example: Sick Dog Dr. Doolittle changed the brand of food he gave his sick dog to eat to see if the dog would heal, keeping the time and the amount the same. Independent Variable: Dependent Variable: Testable Question: Control Variable: Brand of Puppy Food Dog’s Health What is the effect of _________ on ___________? Dog Health Dependent Variable Time, Amount of Food Food Brand Independent Variable

13. Example: Age and Divorce Does the age a couple gets married effect their chances of getting a divorce? Independent Variable: Dependent Variable: Hypothesis: Control Variable: Age Divorce rate If a younger couple gets married, then they will be more likely to divorce. Finances, amount of kids, location

14. Example: Fertilizer Does fertilizer affect plant height? Independent Variable: Dependent Variable: Hypothesis: Control Variable: Fertilizer Plant height If soil is given more fertilizer, its plants will grow taller. Sunlight, water

15. Eggs-periment!!!

16. Exit Ticket Hypothesis: Regardless of the shape or color of the pot, if water is boiling longer, then more water will evaporate. Identify the – –independent variable – –the dependent variable – –control variables

17. Conducting Experiments Vocabulary Review Experiment: Testable Question Variables: A factor that can change in an experiment. Control: What we keep the same in order to make sure it isn’t what’s causing the effect. Dependent Variable: The variable that is affected. Independent Variable: The variable that causes the effect.

18. Example: Coffee Will drinking more coffee help me stay up at night to finish my homework? I will not change how much sleep at night. Independent Variable: Dependent Variable: Testable Question: Control Variable: Drinking Coffee Staying up later at night What is the effect of _________ on ___________? Sleeping at Night Dependent Variable Sleep I get per Night Drinking Coffee Independent Variable