CH 2
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observation
set of values corresponding to a set of variables
frequency distribution
summary of data that shows the number of observations in each of several non-overlapping classes, typically referred to as bins when dealing with distributions
cumulative frequency distribution
variation of the frequency distribution that provides another tabular summary of quantitative data
variation
difference in a variable measured over observations
histogram
common graphical presentation of quantitative data
cross sectional data
data collected from several entities at the same time point in time
time series data
data collected over several time periods