09-08-07
Introduction To Statistics
Vocab Ch. 1-4
KEY TERMS
-observational study
-observe and measure specific characteristics, but doesn’t attempt to
modify the subjects being studied
-experiment
-apply some treatment and then proceed to observe its effects on the subjects
-experimental units
-subjects used in experiments
-cross-sectional study
-data observed, measured, and collected at one point in time
-retrospective (case-control) study
-data collected from the past by going back in time
(through examination of records, interviews, etc)
-prospective (longitudinal, cohort) study
-data collected in the future from groups sharing
common factors (called
cohorts
)
-confounding
-occurs in an experiment whe you are not able to distinguish among the effects
of different factors
-placebo effect
-occurs when an untreated subject reports and improvement in symptoms
-blinding
-technique in which the subject doesn’t know whether he or she is receiving a
treatment or a placebo
-double-blind
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- Fall '08
- Sapko
- Statistics, Randomness, measure specific characteristics, 09-08-07 Vocab Ch., subjects -experimental units-subjects
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