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    In Psychology lesson today, my teacher told us her definition of a confounding variable, "A variable other than the IV that has an affect on the DV", but she said confounding variables aren't necessarily changed as the IV changes. I'm not so sure about that bit. So could anyone please give me the definition of a confounding variable, and how it differs from an extraneous variable?
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    Confounding variables are variables that will affect the results of study (DV) which can't be controlled. For example, a study in energy drinks. If the first group drinks water and also happen to be introverts they would be shy, and if the second group chosen to drink the energy drinks also happen to be extroverts they would already be very outgoing therefore when the results are analysed we can't be sure whether the energy drinks actually worked or if personality affected the results, so personality is the confounding variable. How this differs from extraneous variables is that extraneous can be controlled or removed.
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    (Original post by Annie_La)
    Confounding variables are variables that will affect the results of study (DV) which can't be controlled. For example, a study in energy drinks. If the first group drinks water and also happen to be introverts they would be shy, and if the second group chosen to drink the energy drinks also happen to be extroverts they would already be very outgoing therefore when the results are analysed we can't be sure whether the energy drinks actually worked or if personality affected the results, so personality is the confounding variable. How this differs from extraneous variables is that extraneous can be controlled or removed.
    Ah, thanks for clearing that up! Do confounding variables change systematically with the IV?
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    Yes it does, referring back to my example, a second IV was formed- personality
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    (Original post by Annie_La)
    Yes it does, referring back to my example, a second IV was formed- personality
    I see! Could you also give an extraneous variable from your example please?

    And does the IV cause the confounding variable to change, or not necessarily?
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    There are no extraneous variables in my example as this example is for confounding variables.
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    Hey , sonplease which one out of these is NOT a confounding variable : Sex , Age, choice of degree subject, reaction time.
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    (Original post by RNRN)
    Hey , sonplease which one out of these is NOT a confounding variable : Sex , Age, choice of degree subject, reaction time.
    reaction time -because you can identify and control the other variables before the study.
 
 
 

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