Basic Statistical Symbols[*]
	C	A distribution, also called the distribution for the independent variable
	U	A distribution that is that the not same as X, also called the dependent variable
	SC	Sum all the elements [numbers] in the distribution
	SC^2	Square all the elements [numbers] then add them to each other
	(SC)^2	Add all the elements then square the summation
	N	The number of elements in a population distribution
	n	The number of elements in a sample distribution
	X1	The first element [number] in a distribution
	X2	The second element [number] in a distribution
	Xn	The last element in a distribution
	…	All the elements between two points in a distribution
	SCY	Multiply X1 by Y1, X2 by Y2, …, Xn by Ynand sum the distribution
	a	Greek letter for alpha: the intercept or a type I error
	b	Greek letter for beta: the slope or a type II error
	s	Greek letter for sigma, meaning the standard deviation for the population
	s	Letter s, meaning the standard deviation for the sample
	s^2	Letter s square, meaing the variance for the sample
	s1	In a time series, the first data point; subscripts note the location of the data point
	sn – 1	In a time series, the second to the last data point.
	sn	In a time series, the last data point.
	m	Greek letter mu, meaning the [arithmetic] mean of the population
		Also call "X-bar" meaning the [arithmetic] mean of the sample
	Md	Median
	Mo	Mode
	Gm	Geometric mean
	Hm	Harmonic mean

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[*] Population vs Sample

The population includes all objects of interest whereas the sample is only a portion of the population. Parameters are associated with populations and statistics with samples. Parameters are usually denoted using Greek letters while statistics are usually denoted using Roman letters.