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AgendaAgenda 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)
Independent, Dependent and Independent, Dependent and Control VariablesControl Variables
Bart believes that mice exposed to Bart believes that mice exposed to microwaves will become extra strong microwaves will become extra strong
(he’s been reading too much (he’s been reading too much Radioactive Man.) He decides to put Radioactive Man.) He decides to put
10 mice in the microwave for 10 10 mice in the microwave for 10 seconds and compare their strength seconds and compare their strength to 10 other mice who had not been to 10 other mice who had not been
put in the microwave. put in the microwave.
What is the: cause? Effect? Why What is the: cause? Effect? Why does he leave some mice out of does he leave some mice out of
the microwave? the microwave?
This means we should only This means we should only change one variable at a timechange one variable at a time..
In any experiment, we must be able to In any experiment, we must be able to attribute the effect to a cause. All other attribute the effect to a cause. All other variables that stay the same are called variables that stay the same are called CONTROLLED VARIABLES.CONTROLLED VARIABLES.
In a good experiment a In a good experiment a scientist changes a variable scientist changes a variable
and measures what the and measures what the effect is.effect is. Independent variable: The factor a Independent variable: The factor a
scientist changes; the causescientist changes; the cause Dependent variable: The factor a Dependent variable: The factor a
scientist measures; the effectscientist measures; the effect Controlled variable: Factor that stays Controlled variable: Factor that stays
the same so that results can be the same so that results can be determineddetermined
Conducting ExperimentsVocabulary 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.
More Practice: Independent & Dependent Variables
1. Adding salt to water affects the temperature at which it boils.
2. Putting plants under the sunlight will allow them to grow more.
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.
Testable QuestionsTestable Questions
Testable Question: A question that can be answered by designing and conducting an experiment.
Format: What is the effect of _________ on _________? Independent
VariableDependent Variable
Which of the following is a good Which of the following is a good testabletestable question? Why? question? Why?
A. Will our teachers give us homework A. Will our teachers give us homework tonight?tonight?
B. Why is it always so cold in this room?B. Why is it always so cold in this room?
C. What is the effect of the rolly poly bugs C. What is the effect of the rolly poly bugs on the weight of my frogs? on the weight of my frogs?
Example: Bart 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
strengthDependent Variable
Type of mouse
microwavesIndependent
Variable
Example: Example: Health CoverageHealth 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 AllIndependent
Variable
Example: The Example: The Swine FluSwine 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
Example: Sick DogExample: Sick DogDr. 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 HealthDependent Variable
Time, Amount of Food
Food BrandIndependent Variable
Example: Age and Example: Age and DivorceDivorce
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
Example: FertilizerExample: FertilizerDoes 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
Eggs-periment!!!
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
Conducting ExperimentsVocabulary 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.
Example: CoffeeExample: 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
NightDependent Variable
Sleep I get per Night
Drinking Coffee
Independent Variable