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Unformatted text preview: 09-08-07 Introduction To Statistics Vocab Ch. 1-4 KEY TER MS-observational study-observe and measure specific characteristics, but doesnt 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 doesnt know whether he or she is receiving a treatment or a placebo-double-blind-blinding occurred at two levels (both the subject and the one giving the...
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- Fall '08