.................. We do know about , but ................ We want to know about

consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures

probability : is a group of methods used to collect, describe, analyze, and interpret data and to make decisions.

The population that is being studied is also called the

consists of all elements—individuals, items, or objects—whose characteristics are being studied

A portion of the population selected for study is referred to as a population

The technique of collecting information from a portion of the population is called a sample survey.

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