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

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

Inferential statistics : consists of methods that use sample results to help make decisions or predictions about a population

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

portion of the population selected for study

survey that includes every member of the
population

the technique of collecting information from a portion of the population

Representative sample: is a sample that represents the characteristics of the population as closely as possible.

Nonrandom sample :is a sample drawn in such a way that each element of the population has a chance of beingselected

Characteristics are called parameters

Population : Parameters are generally known

sample : Parameters are always known

Part of the group

is the value of a variable for an element

.............is a collection of observations on one or more variables.

is a variable that can be measured numerically.