The technique of increasing the representation of a

sub-population in order to avoid errors due to small sample sizes.

A group we are interested in studying. Often refers to a group of people, but the term is used for other subjects,

too.

A value far from the central tendency.

A statistic intended to

quantify the skewness of a distribution based on the median, mean,

and standard deviation.

A person who responds to a survey

The deviation of an actual value from a model

A study that follows a population over time,

collecting data from the same group repeatedly.

A model of a system based on the assumption that

an apparent effect is due to chance.

Random noise added to data for purposes of visualization.

An effect that is

unlikely to occur by chance