Statistics Symbols (Chapters 1-6)

Σ

-Upper Greek letter sigma -Used to label the sum of a list of values or as a command to sum the following values (EX)::Σx is command to sum up the x values

CV

-coefficient of variation -Describes the standard deviation relative to the mean, and is expressed as a percent

H

-high -Can refer to the highest value of a class or a data set. -In Chapter 6, H refers to a value stored in the calculator to represent +∞

L

-low -Can refer tot he lowest value of a class or a data set. In Chapter 6, L refers to a value stored in the calculator to represent -∞

'

-lower-case Greek letter mu -Population mean

'

-lower-case Greek letter sigma -Population standard deviation

'

-one standard deviation below the mean

X-S

-one standard deviation below the mean -Similarly: (sample mean) - 2s -- two standard deviations below the mean; (sample mean) + s -- one standard deviation above the mean, etc.

Q

-quartile

X

-sample mean -Read 'x-bar' or 'sample mean.'

X

-sample median -Read 'median'

S

-sample standard deviation

S

-sample variance

Z

-z-score and standard score -The z-score represent the number of standard deviations a data value lies away from its mean

'

Population variance

Q1

first quartile

IQR

interquartile range (Also: iqr)

'

lower-case Greek letter alpha Generally refers to an area/probability See Z(alpha)

n

number of data values, or sample size

P

probability

P(A)

probability of event A

q

probability of failure

p

probability of success

S

sample space

Q2

second quartile (median)

A

the complement of event A

'

the man of the sampling distribution of sample means Read 'mu sub x-bar'

P or P

the observed or sample probability

'

the standard deviation of the sampling distribution of sample means. Read 'sigma sub x-bar.' Also called 'standard error.'

Z

the z-value the ahs an area of alpha to its riht Read 'z of alpha'

Q3

third quartile