variables

• definition of independent variable

  what the researcher changes in order to see an effect on something that they are measuring
• definition of dependent variable

  the variable the researcher measures
• definition of extraneous variable

  a variable other than the IV which could affect the DV and therefore needs to be controlled
• definition of confounding variable

  a variable other than the IV which has actually directly affected the DV by mistake
• what are the four types of variables

  independent variable [ID], dependent variable [DV], extraneous variable, confounding variable