Greek letter equivalent of s, written σ, commonly used to denote the standard deviation of a distribution or a set of data. The capital ∑ is used to denote the sum in the summation notation.
The symbol usually used to denote the standard deviation of a population; σ2 denoting the variance.
Symbol used to denote a sum. Thus
The sample mean for n observations x1, x2,…, xn is
and the unbiased estimate (see estimator) of the population variance is
- chronostratic scale
- chronostratigraphic correlation chart
- chronostratigraphic horizon
- chronostratigraphic scale
- chronostratigraphic unit
- chronostratigraphy
- chronotope
- chronotron
- chronozone
- chrysalis
- chrysanthemum
- Chryse Planitia
- Chrysippus (c.280–207)
- Chrysippus’ dog
- chrysoberyl
- chrysocolla
- Chrysophyceae
- Chrysophyta
- chrysotile
- Chrétien, Jean (1934)
- Chrétien, Jean-Loup Jacques Marie (1938– )
- CH star
- ChubuSat-1
- chuck-a-luck
- Chu His (1130–1200)