BUAL 2600 EXAM 1 QUESTIONS WITH CORRECT ANSWERS

samples that over- or underemphasize some characteristics of the population


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biased




vast digital repositories where data are recorded and stored electronically


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data warehouses




a sample that includes the entire population

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census




an entire collection of individuals


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population




when a variable names categories and answers questions about how cases fall into
those categories


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categorical/qualitative variable




when we slice the population into homogeneous groups, called strata, use simple
random sampling within each stratum, and combine the results at the end


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stratified random sampling




combining percentages across very different values or groups can give confusing
results because percentages are inappropriately combined

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simpson's paradox




a sample that estimates the corresponding parameters accurately


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representative




any intersection of a row and column of a contingency table that gives the count for a
combination of values of the two variables


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cell




when two or more separate data tables are linked together so that information can be
merged across them


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relational database




a large group of individuals is invited to respond, and all who do respond are
counted - results from these are almost always biased and wrong