UNIT 4 : Study Procedures

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UNIT 4 : Study Procedures
2013-11-06 17:04:07
study procedures

When & How, procedures, Validity, time points
Show Answers:

  1. What are study time points?
    The number of times data are collected (from the same participants)
  2. What is a study design?
    Overall approach used in the study.
  3. What is a study protocol?
    Activities and tools used to collect data.
  4. What is Internal Validity?
    - The study can be replicated by other scientist (others can redo)

    • - More tied to procedures
    • - What you see is a function of what you did
  5. What is External Validity?
    • - The findings can be generalized to the intended population. (can be applied to another group)¬†
    • -Less tied to procedures
  6. What are threats to Internal Validity?
    (manipulation of independent variable)

    • 1- History
    • 2- Maturation
    • 3- Selection
    • 4- Testing (pretest)
    • 5- Instrumentation (scores)
    • 6- Regression (away from mean)
    • 7- Mortality (drop-outs)
  7. What are threats to External Validity?
    • 1- Multiple treatment Interference
    • 2- Reactive Arrangements (Hawthorne effect: in that participants know about a research experiment)
    • 3- Experimenter Effects
    • 4- Pretest sensitization (can tell people what is to come)
  8. How do you increase Internal and External validity?
    Interval: Randomly select participants, randomly assign into groups, and use a control group

    External: Ensure that researchers do not effect outcome
  9. What are extraneous variables and how can you control them?
    Factors that can decrease the internal validity of a study.

    • Control by:
    • -Ignoring any variable that is unrelated to the dependent variable being measured.
    • -Use of randomization that the effects of many different potential sources of variance can be controlled.¬†

    Also by Matching, using homogeneous groups, and analysis of covariance (ANCOVA)
  10. What is a time sequence?
    Order of occurrence (before, after) (this, that)
  11. What is causality?
    Presence of cause and effect.

    Ex. Because he gives you a ring (before), you will get married (after).