Sampling and its methods

Simple random sampling
Small homogeneous population

Large non homogenous scattered population

Non homogenous large population
Sample is drawn randomly from each stratum of homogenous subgroups

Large country survey using random sampling technique

Sampling in different phases
Ex: in a positive case of tuberculosis

Grouping the population and then surveying the entire population
Ex: - Immunization / vaccination coverage

Jugdemental / Purposive
Deliberatily selected by the researchers with pre-defined criteria or a purpose

Sample are drawn according to the availability.

Population is divided according to their different characteristics

Used for hidden population who are difficult to access ex: drug users
Existing subjects recruits further subjects

MCQS

a) Simple random
b) Stratified random
c) Convenient
d) Systematic

Since population is drawn randomly from each sub groups