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Variables

Independent vs. Dependent
by

Emily Holdsworth

on 23 September 2016

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Transcript of Variables

Controls
Independent vs. Dependent

Scientific Variables
Any factor, trait, or condition that can exist in differing amounts or types.
Variables
Changed by the scientists
Then the scientist observes what happens
To have a fair test, an experiment only has 1 variable
There are 3 types of variables:

1. Independent
2. Dependent
3. Controlled Variables
4. Control Group (Not all experiments have this)
Measured by the scientist (What you measure)
Responds to the changes made by the independent variable
May be more than 1 in an experiment.
Independent
(Manipulated)

Dependent
(Responding)

Hypothesis:
If the amount time a dog spends outside is related to the number of fleas it gets then, a retriever that spends more time outside will have have more fleas because fleas live outside.
Example # 1:
Scientific Question:
How does the amount of time a dog spends outside affect the number of fleas it gets?
What will you measure? (Dependent)
Number of Fleas on a dog

What will you change? (Independent)
Amount of time a dog spends outside
Relationship:
Amount of time a dog spends outside and the number of fleas it gets
Example # 2:
Scientific Question:
How does salt content (0%, 10%, 20%) in soil affect the growth of bean plants?
Hypothesis:
If salt content in soil is related to bean plant growth then, plants grown in soil with 20% salt will be smallest because sodium reduces the ability of plants to get water from the soil.
Independent:
What will you change?
Dependent:
What will you measure?
Independent:
Salt content in the soil

Dependent:
Growth of the plant
Example # 3
Scientific Question:
How does the brand of gum affect how long the flavor lasts?
Hypothesis:
If the brand of gum is related to how long the flavor lasts then, Five gum's flavor will last longest based upon my own experience.

Independent variable
Dependent variable
What are the variables?


Independent:
Brand of gum

Dependent:
How long the flavor will last.
Example
What would be some variables when you talk about cars?
What are your Dependent and Independent Variables?
Variables
What are the variables?
What are your variables?
What is the relationship?
Relationship:
brand of gum and how long the flavor lasts
Variables:
Control Group
A group that stay the same through all phases of an experiment to keep consistency and limit bias
Experiment:
Same sunlight as before
Add 2 hours more of sunlight
Take away 2 hours of sunlight
How does the amount of sunlight affect how quickly a sunflower grows?
What are the Dependent and Independent variables?
Independent: Amount of Sunlight

Dependent: How fast the sunflower grows
How does the amount of sunlight affect how quickly a sunflower grows?
How does the amount of water consumed a day affect how healthier you are?
Experiment:
Same amount of water (4 glasses)
Less water (2 glasses)
More water (6 glasses)
What are the Independent and Dependent?

Independent: Amount of water consumed a day
Dependent: Your health
How does the amount of water consumed a day affect how healthier you are?
Controlled Variables
Quantities that a scientist wants to remain constant to keep consistency and limit bias.
For example, in an experiment that tests how plants grow in difference amounts of light, the
controlled variables
that must be controlled would be, the
type of plant
tested,
container
,
type of soil
,
temperature
,
amount of water
,
humidity
,
type of light
, etc…needs to be the same for every plant tested.
Example
What about your experiments?
What about controlled variables?
Controlled Variables...
Dog Breed
Dog Size
Dog Fur (Length, Color)
What else?
What about controlled variables?

What about a Control Group?
Controlled Variables
Bean plant
Sunlight
Water
Soil Type
Container
What about controlled variables?
Controlled Variables
Chewing Speed
Amount of Saliva
Person
What they ate that day
What are the variables?
Amount of sunlight and how quickly a sunflower grows
Example # 3:
What about the controlled Variables?
Sunflower type
Water amounts
Soil
Container

What about a control group?
What about controlled variables and a control group?
Controlled Variables: Same water, diet, physical exercise, sleep amount

Control Group: The group that drinks the same amount of water
Controlled Variables vs. Control Group
Example # 4:
What are the variables?
Full transcript