Research Final 2

  1. Simple random assignment
    • easiest way to be sure that the experimental groups are roughly equal to start
    • each participant has equal probability of being assigned to any¬†experimental¬†condition
  2. Matched random assignment
    • increase similarity between groups
    • using p's scores on a measure known to be relevant to outcome of experiment
    • matched a pair of subjects- one randomly assigned to one condition, other to other condition
  3. Repeated measure designs
    • when different subjects are assigned to different conditions: randomized groups design or between subjects
    • in some studies the same individuals are in each treatment condition: within-subjects or repeated measures design
  4. Advantages of Within-Subjects
    • more powerful: more likely to detect effects of IV - p's are identical
    • require fewer p's
  5. Disadvantaged of Within-Subjects
    • order effects: each p gets all treatments, order in which they receive them may have an effect on behavior
    • guard against order effects: counterbalancing- presenting the levels of IV in different orders to different participants
    • even with counterbalancing, there may be carryover effects: effects of 1 level of IV are still present when another level is introduced
  6. Selection of subjects
    • probability (random) vs. non-probability (non-random) sampling
    • convenience sampling, quota sampling,¬†purposive sampling
Card Set
Research Final 2
Research Final 2