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SPECIAL TOPICS:   Histograms/Central tendency    Sensitivity/Specificity   Rates   Critical review 

               Evaluation Research   Definitions    Designs  Sample size  Sample methods  Confounding 

Survey (representative sample)

Census (whole population)

Poll (usually a single question for political purposes)

UNIVARIATE (FOR PERSONAL CHARACTERISTICS)

TWO-VARIABLE ANALYSIS (USING CROSS-TABULATION) IS MOST USEFUL.  BUT THEY SHOULD BE COMPLETED USING PERCENTAGES (ADDING TO 100% ALONG THE INDEPENDENT VARIABLE), AND TOTALS, TITLE AND COMMENTS.