QUESTIONS AND ANSWERS
Define: categorical variable - ANS variable that takes values in one of several categories
ex: gender, race, major
Define: quantitative variable - ANS variable that takes numerical values where arithmetic
makes sense
ex: age, SAT score, time until arrival
Define: observational study - ANS Passive data collection. Nothing is done to influence the
variables on the units in the sample.
tends to be more cost effective
Define: experiment - ANS Treatment is applied to some units. Variables on units are
measured with the intention of determining if the treatment affects the variables.
Whats the difference between a histogram and a bar graph? - ANS Histogram bars touch and
1
their width is related to the value range, used for quantitative data
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