Statistics symbols and terms review

Symbols 1

100

μ

Population mean

200

σ

Population standard deviation

300

x̄

Sample mean

400

s

Sample standard deviation

500

Σ

Summation

Symbols 2

100

N

Population size

200

n

Sample size

300

x

Variable

400

σ2

Population variance

500

s2

Sample variance

Symbols 3

100

Q1

First quartile

200

Q2

Second quartile/median

300

Q3

Third quartile

400

IQR

Interquartile range

500

z

Random variable that follows a standard normal distribution

Symbols 4

100

p

Probability of success

200

P

Probability

300

q

Probability of failure

400

t

Test statistic

500

c

Constant

Terms

100

Population

The entire group about which information is desired.

200

Sample

A part of the population selected for study.

300

Parameter

The numerical characteristic of a population.

400

Statistic

The numerical characteristic of a sample.

500

Data

The observations that have been collected.