Symbols 1
μ
Population mean
N
Population size
Q1
First quartile
p
Probability of success
Population
The entire group about which information is desired.
σ
Population standard deviation
n
Sample size
Q2
Second quartile/median
P
Probability
Sample
A part of the population selected for study.
x̄
Sample mean
x
Variable
Q3
Third quartile
q
Probability of failure
Parameter
The numerical characteristic of a population.
s
Sample standard deviation
σ2
Population variance
IQR
Interquartile range
Test statistic
Statistic
The numerical characteristic of a sample.
Σ
Summation
s2
Sample variance
Random variable that follows a standard normal distribution
Constant
Data
The observations that have been collected.