Statistical Population Concept

Statistical Population Concept

Population is set of all possible observation. For example all students in a school is population. Statistical population is not necessarily required to represent a whole population of area; rather it is a group of people which is being studied.

Statistical Population Size

Statistical population size means the number of possible outcome or observation of finite population. For example we studying height of 9^th class student, then population size is would be total number of student in the 9th class.

Statistical Population Parameter

Statistical population mean the numeric value assigned to population. For example the average height of 9^th class student is 5 feet that was calculated from the population of 50 student of 9^th class. Height of 5 feet is parameter (represent population).

Statistical Population Types

Population can be broadly classified as under

1.    Finite Statistical population

Population which represents or consists of a fixed number of values is known as finite population. For example number of student in school, number of student in class, number of flights from Karachi airport.

2.    Infinite Statistical population

Population which size is not exactly known is regarded as infinite population. Infinite population size is so large that no one can exactly tell about size. For example, Particles of sand in a desert, number of point on a line.

3.    Real Statistical Population

Population that represents real values is known real population i.e. age, height, weight, length.

4.    Hypothetical Statistical population

Population may comprise of hypothetical events or observation i.e. possible outcome of coin toss, possible outcome of a cricket match, etc.