The investigator believes that in his opinion, some objects are the best representative of the population than others. It involves “hand picking” of sampling units. That is the interviewer uses his judgment in the selection of the sample that who should represent the population to serve the investigator’s purpose. It is usually used when a limited number of individuals possess the trait of interest. This type of sampling is also known as purposive sampling. This is useful when selecting specific people, specific events, specific prices of data, etc.
Selecting members for a competition like quiz, oratorical contest to represent a school.
· Low expense.
· Minimum time needed.
· Highly subjective.
· Generalization is not appropriate.
· Certain members of the population will have a smaller chance or no chance of selection compared to others.
· This method does not give representative part of the population, since favoritism is involved.