some members of the population may not have any chance of being selected in the sample.

The characteristics of a Population are called ......... (جت في الامتحان )

sample drawn in such a way that each element of the population has a chance of being selected

is the value of a variable for an element

is a collection of observations on one or more variables

is a characteristic under study that assumes different values for different elements

nominal variables, Ordinal variables

is a variable that can be measured numerically.

Discrete variable :is a variable that can assume any numerical value over a certain interval.

is a variable whose values are countable

can assume only certain values with no intermediate values

has a clear ordering.

Finishing tine for runners in a race (جت في الامتحان )

A data set consisting of observations on two or more attributes

bivariate data set : A data set consisting of observations on a single attribute

A data set consisting of observations on two different attributes

Bivariate data are a special case of

in a stratified random sample, we first divide the population into nonoverlapping subgroups,
which are called …

this sampling technique, each sample of the same size has the same chance (probability) of
being selected

we first randomly select one member from the first k units. Then every*th member, starting with the first selected member, is included in the sample.