extraneous variables

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a extraneous variable is any factor that could influence the behaviour of partiicpants and influence change in the dependant variable

types of extraneous variable

  • participant (intelligence, age, gender)
  • situational (temperature, instructions, time of day)
  • demand characteristics
  • investigator effects

demand characteristics

  • occur when the participants guess what the investigation is about and change their behaviour accordingly
  • likeliyhood of demand charavterisitcs can be reduced by postiviely decieving particpants and using a single blind design ( when you…


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