an organization of people with a common purpose and having a formal structure.
the act of associating or state of being associated.
connection or combination.
the connection or relation of ideas, feelings, sensations, etc.; correlation of elements of perception, reasoning, or the like.
Bar Chart
a graph using parallel bars of varying lengths, as to illustrate comparative costs, exports, birth-rates, etc.
Box-and-Whisker Plot
(aka Box Plot)
a graphical summary of data that is based on a five-number summary. A key to the development of a box plot is a computation of the interquartile range, IQR = Q3 - Q1.
Categorical Data
Data that can be grouped by specific categories are referred to as categorical data.
Categorical data use either the nominal or ordinal scale of measurement.
Census
The process of conducting a survey to collect data for the entire population is called a census.
Central Tendency
the tendency of samples of a given measurement to cluster around some central value.
Chebyshev's Theorem
Chebyshev's theorem enables us to make statements about the portion of data values that must be within a specified number of standard deviations of the mean.
At least 75%, of the data values must be within 2 standard deviations of the mean.
At least 89%, of the data values must be within three standard deviations of the mean.
At least 94%, of the data values must be within four standard deviations of the mean.