Research Methods 1

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  1. What methods can be used to control secondary variables?
    • Elimination - completely remove the variable
    • Constancy - ensure variable is constant for all participants
    • Convert variable to an IV
    • Randomisation - smear unknown/uncontrollable variables across sample
    • Statistical adjustment - use change scores (pre and post), or ANCOVA
  2. List 10 sources of experimental invalididty
    • Retroactive history - something that changes during course of experiment
    • Regression to the mean - extreme scores on a pre-test that move closer to the mean post-test
    • Repeated testing - learning or sensitisation effects
    • Proactive history - subject variables
    • Interaction effects - effects of earlier treatment still present during subsequent treatments
    • Loss of participants - of concern if due to treatment
    • Maturation - important for studies that run over long periods of time
    • Experimenter bias
    • Errors in measurement of DV
    • Errors due to inappropriate
  3. What are possible types of problems related to generalisation?
    • Subjects - how representative of the general population are they?
    • Settings - laboratory vs field/natural setting
    • Experimenter - influence on DV due to interpersonal skills and mode of interaction
    • DV - validity of operationalisation, measures
  4. What is the p-value?
    Probability that differences between means is due to chance alone if the null hypothesis is true
  5. What is the relationship between F and t when there are only 2 groups?
    F = t2

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Research Methods 1
2013-05-29 22:24:10

Chapter 1
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