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Identifying Variables
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Types of Variables There are 2 main types of variables:
Independent Variable: The variable that is changed by the scientist; the ‘I control’ variable Dependent Variable: The variable that might change because of what the scientist changes – what is being measured = the DATA
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Remember! Your hypothesis can TELL you what your variables are!
Ex. If I drink Mountain Dew before bed, then I will not sleep very much. IV: Drinking Mountain Dew DV: the amount of sleep
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Use this hypothesis to identify the variables:
Practice Use this hypothesis to identify the variables: If I leave all the lights on all day, then my electric bill will be expensive IV: ______________________ DV: ______________________
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The taste of fruit depends upon how ripe it is.
IV: ______________________ DV: ______________________
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The tire is flat due to a hole in it.
IV: ______________________ DV: ______________________
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Happiness of teachers results from students passing tests.
IV: ______________________ DV: ______________________
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Outgoing students will have more fun at school events.
IV: ______________________ DV: ______________________
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Completing homework impacts test grades.
IV: ______________________ DV: ______________________
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The air pressure of a basketball affects the height when bounced.
IV: ______________________ DV: ______________________
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The amount of money one has determines what he/she will buy.
IV: ______________________ DV: ______________________
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The larger the balloon, the louder the POP!
IV: ______________________ DV: ______________________
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The number of students at school depends on the day of the week.
IV: ______________________ DV: ______________________
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If I brush my cat more, then there will be less fur on my furniture
IV: ______________________ DV: ______________________
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If I miss the bus then I will be late for school.
IV: ______________________ DV: ______________________
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The warmer it is outside, the more people will be at the pool.
IV: ______________________ DV: ______________________
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The amount of water affects the growth of a plant
IV: ______________________ DV: ______________________
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Now read the following experiment and identify the independent and dependent variables
Elizabeth wanted to test if temperature affected how fast milk goes bad and curdles. She left milk in a room temperature closet, a fridge, and a oven that was turned on low heat. She then measured how rotten the milk was after 10 days. IV: ____________________________________ DV: ____________________________________
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