Design

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  • Created by: Georgina
  • Created on: 14-04-14 13:50
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  • Design
    • aims
      • purpose of investigations
    • hypothesis
      • alternative
        • directional
        • non-directional
      • null
    • experimental designs
      • independent groups design- different ppts are used in each conditions
        • no order effects
        • individual differences
      • repeated measures- the same ppts are used in each condition
        • fewer ppts needed
        • no individual differences
        • order effects
        • demand characteristics
      • Matched pairs design- each group of ppts are carefully matched on all variables considered relavent to experiment
        • advantages of both repeated measures and independent group design
        • - diffficult to carry-out costly and slow its dependent on the use of pre-testing ppts
    • design of naturalistic observations
      • time interval sampling, recording what occurs e.g. every 10 mins
      • time point sampling recording what occurs at given points of time e.g. meal time
      • event sampling, recording a complete event
    • design of questionnaires and interviews
      • Questionaire
        • face to face, by post, or online
        • need to be piloted
        • close or open q's
        • number of q's and order
        • clear lang
        • avoiding leading or bias q's
        • one q at a time
      • Interview
        • face to face, or telephone
        • preliminaries to int.
        • the questions
        • the interview provedure
          • semi-structures
          • self-presentaton
          • decide how it is to be recodrded
    • operationalize variables
      • IV and Dv
    • pilot study
      • To find problems with
        • design
        • clarity of standardised instructions
        • measuring iinstruments
    • control of extraneous variables
      • if not they become extraneous variables
      • they can effect DV
      • random error
        • cant be predicted
          • e.g. room temp, ppts motivation, state of mind
      • Costant errors
        • affect DV consistently
          • e.g. individual differences
    • reliability
      • Testing Reliability
        • split-half method
        • Test-retest
    • validity
      • Testing
        • face validity
        • content validity
        • concurrent validity
        • predicitve validity
    • ethics
    • sampling
    • demand characteristics
    • investigator effects

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