Types Of Experiments 0.0 / 5 ? PsychologyResearch methods and techniquesA2/A-levelAQA Created by: Jscott18Created on: 05-11-17 15:22 Lab Experiments Tightly controlled and artificial Manipulates IV and measures DV Minimises extraneous variables Instructions are standardised Advantages: High internal validity IV is responsible for changes on the DV so statements about cause and effect can be made High reliability Controlled so can be replicated / repeated Disadvantages: Low ecological validity and mundane realism Unlikely to be representative of real life so cant generalise Demand characteristics Participants are aware they are taking part so may alter their behaviour 1 of 3 Field Experiments Conducted in a natural / 'real world' environment .e.g. hospital, park Manipulates IV and measures DV Minimal control od extreneous variables Advantages: Higher ecological validity and mundane realism Representative of everyday life so can be generalised Fewer demand characteristics Participants are unaware they are in an experiment so their behaviour is natural Disadvantages: Low internal validity Can't say that the IV is responsible for any changes in the DV due to EV's Poor reliability: The same conditions will not be able to be replicated so it can't be repeated 2 of 3 Natural And Quasi Experiments No random allocation of participants to conditions Measures DV but little control of extraneous varaibles Quasi = Involves the IV of participants 'self-selecting' themselves into conditions Natural = Involves the IV not being programmed by anyone Advantages: Allows the study of areas which would not normally be studied for practical or ethical reasons A way to investigate sensitve topics .e.g. child neglect Fewer demand characteristics Unaware they are taking in an experiment so their behaviour will be natural Disadvantages: Usually investigate reasonably rare events Reduces to opportunities for research Lowest levels of internal validity Participants are not ramdomly assigned but automatically assigned based on things like age Likely to be affected by confounding variables 3 of 3
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