Research Exam 2 Ch 6 7 8

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Research Exam 2 Ch 6 7 8
2015-02-17 13:41:32

Ch 6, 7, & 8
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  1. What is a relationship between two variables when the change of one variable is associated with a change in the other
  2. What type of relationship occurs when one variable's value increases causing the other variable to also increase
  3. what type of relationship occurs when one variable's value increases and the other's value decreases
  4. What type of scale is a measurement scale with a range of numerical values having equal distance between them
  5. What is the Pearson r statistic and what does it determine
    • -1 to +1
    • The strength of the relationship between two variables.
    • close to -1 (negative relationship)
    • 0 (independent of each other)
    • +1 (positive relationship)
  6. What is r is -0.8? +0.8? -0.5? +0.5? 0?
    • strong neg
    • strong pos
    • moderate neg
    • moderate pos
    • weak
  7. 6 classical features of experimental study
    • well-defined target population
    • adequate sample size
    • random assignments
    • control of extraneous influences and bias
    • consistent delivery of interventions
    • low level of missing data
  8. What is the right way to determine sample size for correlational and experimental studies
    power analysis
  9. 3 limitations of randomized experiments
    • Findings are average (not unique)
    • Weak generalizability
    • Controlled manner (not everyday)
  10. 3 key features differientiating experimental research from quasi-expiremental
    • random assignments
    • tight control
    • comparison group
  11. What type of study draws a sample from a larger population and classifies them into two distinct groups (those with risk factors and those without it)
  12. When are cohorts identified in a study
    After exposure of risk factor and before the outcome of interest develops
  13. How are cohort studies different than experiments
    contrasting groups are not created by random assignment, based on exposure to risk factor
  14. What is it called if the difference is a determinent of the outcomes being studied and is unequally distributed into two groups
    confounding variable
  15. Name four types of data measurements
    • nominal
    • ordinal
    • interval
    • ratio