Controlling Variables. Hypothesis The hypothesis is an educated guess about the relationship between...
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Transcript of Controlling Variables. Hypothesis The hypothesis is an educated guess about the relationship between...
Controlling Variables
Hypothesis
The hypothesis is an educated guess about the relationship between the
independent and dependent variables.
Let’s learn about the 3 types of variables!
The 3 types of variables!
Independent Variable• Independent Variable – the one thing that is
changed in an experiment–What is tested–What is manipulated
Dependent Variable• Dependent Variable: the variable that is
affected by the change in the independent variable–What is measured–What is observed– The data collected during the investigation– the factor that may change as a result of
changes made in the independent variable.
Controlled Variables• Constant: a variable that is not changed–Also called controlled variable–Allows for a “fair test”
• Control group: exposed to the same conditions as the experimental group, except for the variable being tested.
• Serves as the standard of comparison.• The control group may be a “no treatment" or
an “experimenter selected” group.All experiments should have
a control group.
Identify the variables:• Hypothesis: If we add more air, the ball will
bounce higher.– Independent variable:• the amount of air in the ball
– Dependent variable: • How high the ball bounces
– Controlled variables: • type of ball, drop the ball from the same height, drop the
ball on the same surface
Identify the variables:• Hypothesis: If a plant gets sunlight it will
grow taller.• Independent variable: – sunlight
• Dependent variable: – Growth of plants
• Controlled variable: – Type of plant, pot, dirt, water, location, fertilizer