CONTROL VARIABLES

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  • Created by: _Holly98
  • Created on: 12-12-15 11:10

EXTREANOUS VARIABLES

INDEPENDANT VARIABLE MANIPULATED AFFECT DEPENDANT VARIABLE

ONLY INFLUENCE DV SHOULD BE IV

ADDITIONAL / UNWANTED VARAIBLE = EXTREANOUS 

LOTS EASY CONTROL E.G. AGE OF PERSON

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CONFOUNDING VARIABLES

CHANGE SYSTEMATICALLY WITH IV

EG. PERSONALITY CANT BE SURE WITH RESULTS

EXTROVERTS VARY IV CAUSE AFFECTS DV

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DEMAND CHARACTERISTICS

PARTICPANTS WORK OUT WHAT TRYING TO DO 

INTEPRET WHATS GOING ON 

LEAD ACTING CERTAIN WAY 

PLEASE YOU 

SCREW YOU

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INVESTIGATOR EFFECTS

INFLUECE OUTCOME BECAUSE OF INVESTIGATOR

HUGH COOLICAL INCUDE EXPECTANCY EFFECTS  & UNCONSCIOUS CUES

REEER ACTORS RESEARCHER RELATED TO STUDY DESIGN 

EG. LEADING QUESTIONS

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RANDOMISATION

ATTEMPT CONTROL INVESTIGATOR EFFECTS 

EG EXPERIMENT ON RECALLING WORDS LIST

WORDS RANDOMLY GENERATED INVESTIGATOR NO CONTROL

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STANDARDISATION

PARTICPANTS SUBJECT SAME ENVIORNMENT, INFO & EXPERIENCE

ENSURE THIS PROCEDURES STANDARDISED

INCLUDE INSTRUCTIONS READ PARTICIPANTS

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