Variables

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• Title
• Variables

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Variables C-Notes
The things in your experiment that never change.

• Constant

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Constants

• In the penny lab, what were some things that were
  constants? Things that didnt change at all
  during the experiment?

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Variables C-Notes
The sample in your experiment you are comparing
other samples to.

• Control

If we did another lab with different types of
coins, your penny might be your control. You
might want to know how many drops of water coins
can hold compared to a penny.
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Variables C-Notes
The things in your experiment that change.

• Variables

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Variables

• In the penny lab, what were some variables?
  Things that changed or were different in the lab.
  

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Variables

• The number of drops the penny held
• The person dropping the water
• The height you dropped the water from
• The type of eye dropper you used

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Remembering types of variables DRY MIX

• D ependent
• R ecord/respond
• Y axis
• M anipulate (manos)
• I ndepent (I change)
• X - axis

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Variables
The thing that I change in the experiment. What
did I make different?

• Independent
• Variables

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Variables
What am I recording or writing down, what is
changing by itself during the experiment.

• Dependent
• Variables

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Variables

• During the penny lab John and Daviyance
• found that there penny held 25 drops the first
  time, 35 the second time, and 30 the third time.
  They took turns dropping water onto the penny,
  and each one used a different type of pipette.
• What are some independent variables?
• What is the dependent variable?

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• A group of college students were given a short
  course in speed-reading. The instructor was
  curious if a monetary incentive would influence
  performance on a reading test taken at the end of
  the course.  Half the students were offered 5
  for obtaining a certain level of performance on
  the test, the other half were not offered money. 
   
• What is the independent variable?
• What is the dependent variable?

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• A group of college students were given a short
  course in speed-reading. The instructor was
  curious if a monetary incentive would influence
  performance on a reading test taken at the end of
  the course.  Half the students were offered 5
  for obtaining a certain level of performance on
  the test, the other half were not offered money. 
   
• What is the independent variable?
• The money, some were given money some were not.
• What is the dependent variable?
• Reading Performance

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• A social psychologist thinks that people are more
  likely to conform to a large crowd than to a
  single person.  To test this hypothesis, the
  social psychologist had either one person or five
  persons stand on a busy walking path on campus
  and look up.  The psychologist stood nearby and
  counted the number of people passing by who also
  looked up.
• What is the independent variable?
• What is the dependent variable?

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• A social psychologist thinks that people are more
  likely to conform to a large crowd than to a
  single person.  To test this hypothesis, the
  social psychologist had either one person or five
  persons stand on a busy walking path on campus
  and look up.  The psychologist stood nearby and
  counted the number of people passing by who also
  looked up.
• What is the independent variable?
• The number of people looking up (1 or 5)
• What is the dependent variable?
• How many people passing by look up

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What is the independent variable? What is the
dependent variable?
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What is the independent variable? The new sauce,
Group A got it, Group B did not. What is the
dependent variable? The number of customers who
had reduced gas
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What is the independent variable? What is the
dependent variable?
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What is the independent variable? 2 variables,
Dr. Kelp and Seaweed What is the dependent
variable? Did Garys slimitosis clear up Poorly
designed experiment because there are too many
independent variables.
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Exit Slip Quiz

• Example 1
• A researcher is studying the effect of sleep on
  aggression, thinking that less sleep will lead to
  more aggression. She has some people sleep 6
  hours per night, some people sleep 3 hours per
  night and some people sleep as much as they want.
  She then monitors aggressive behavior during
  basketball games among participants.
• What is the independent variable?
• What is the dependent variable?

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Exit Slip Quiz

• Example 1
• A researcher is studying the effect of sleep on
  aggression, thinking that less sleep will lead to
  more aggression. She has some people sleep 6
  hours per night, some people sleep 3 hours per
  night and some people sleep as much as they want.
  She then monitors aggressive behavior during
  basketball games among participants.
• What is the independent variable?
• Amount of sleep participants got.
• What is the dependent variable?
• Aggressive behaviro during the game

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• Example 2
• A researcher is curious to find out what effect
  classical music has on peoples level of
  relaxation (as measured by heart rate). He
  suspects that listening to classical music will
  make people feel more calm and relaxed. He lets
  one group listen to classical music for one hour.
  He lets another group sit in a quiet room for one
  hour (i.e they hear no music). After one hour, he
  monitors the heart rate of each participant to
  measure their level of relaxation.
• What is the Independent Variable?
• What is the Dependent Variable?

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• Example 2
• A researcher is curious to find out what effect
  classical music has on peoples level of
  relaxation (as measured by heart rate). He
  suspects that listening to classical music will
  make people feel more calm and relaxed. He lets
  one group listen to classical music for one hour.
  He lets another group sit in a quiet room for one
  hour (i.e they hear no music). After one hour, he
  monitors the heart rate of each participant to
  measure their level of relaxation.
• What is the Independent Variable?
• Music, group 1 listened to it for 1 hr, group 2
  had no music.
• What is the Dependent Variable?
• Heart rate