# What do statistics symbols mean?

## What do statistics symbols mean?

Table of Contents

The symbol ‘μ’ represents the population mean. The symbol ‘Σ Xi’ represents the sum of all scores present in the population (say, in this case) X1 X2 X3 and so on. The symbol ‘N’ represents the total number of individuals or cases in the population.

## What symbol represents mean?

In journal articles, the mean is usually represented by M, and the median by Mdn. Standard deviation symbols: s (the greek lower-case letter,”sigma”) is usually used for the population standard deviation. s is used to denote the standard deviation of a sample of scores.

**What is the symbol for population median?**

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sample statistic | population parameter | description |
---|---|---|

M or Med or x̃ “x-tilde” | (none) | median |

s (TIs say Sx) | σ “sigma” or σx | standard deviation For variance, apply a squared symbol (s² or σ²). |

r | ρ “rho” | coefficient of linear correlation |

p̂ “p-hat” | p | proportion |

**What does AUB mean in probability?**

P(A U B) is the probability of the sum of all sample points in A U B. Now P(A) + P(B) is the sum of probabilities of sample points in A and in B. Since we added up the sample points in (A ∩ B) twice, we need to subtract once to obtain the sum of probabilities in (A U B), which is P(A U B).

### What does μ?

The lowercase Greek letter mu (µ) is used to represent the prefix multiplier 0.000001 (10 -6 or one millionth). For example, 0.000000001 farad or 10 -9 F of capacitance is commonly written as 0.001 µF.

### What does Y with a line over it mean?

Usage. The y bar symbol is used in statistics to represent the sample mean of a distribution.

**What does the mean symbol look like?**

The sample mean symbol is x̄, pronounced “x bar”. The sample mean is an average value found in a sample.

**What is the symbol for population variance?**

symbol σx2

The sample variance is defined by(15.59)We use the symbol sx2 for a sample variance and the symbol σx2 for a population variance.

#### What does the symbol SD represent?

Standard deviation may be abbreviated SD, and is most commonly represented in mathematical texts and equations by the lower case Greek letter sigma σ, for the population standard deviation, or the Latin letter s, for the sample standard deviation.

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