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Let
. A value
such that
is considered
``significant'' (i.e., is not simply due to chance) is known as an Alpha Value. The Probability that a
variate would assume a value greater than or equal to the observed value strictly by chance,
, is known as a
P-Value.
Depending on the type of data and conventional practices of a given field of study, a variety of different alpha values
may be used. One commonly used terminology takes
as ``not significant,''
,
as ``significant'' (sometimes denoted *), and
as ``highly significant'' (sometimes denoted **). Some
authors use the term ``almost significant'' to refer to
, although this practice is not
recommended.
See also Alpha Value, Confidence Interval, P-Value, Probable Error, Significance Test, Statistical Test