MODULE 4 & 5: MEASURES OF VARIABILITY AND PROBABILITY

variability

it is defined in terms of distance. It tells how much distance to expect within one score and another.

range

the distance covered by the scores in a distribution, from smallest to largest score.

standard deviation

provides a measure of the spread between numbers in a data set.

variance

average distance from the mean.

z-scores

specifies the precise location of each scores in a distribution

always zero

the characteristic of the mean of a z-score.

always one

the characteristic of the standard deviation of a z-score.

probability

relationship between samples and population are defined in terms of

Fractions, Decimal, or Percentage

obtained probability values are expressed in

symmetrical

characteristic of normal distribution

body

it corresponds to the larger part

tail

it is always the smaller section

unit normal table

this contains the list of relationship between proportion and z-score locations in a normal distribution.