Research
Methodology I.
THE LOGIC OF SAMPLING
When to sample?
•If we want to have the most accurate information about a
large population with the least expenses and time
consumption.
•If it is impossible (eg. infinite) or it is too expensive or time
consuming to observe the total population.
Two types of sampling
•NONPROBABILITY SAMPLING
•The probablity of selection is not the same for all members of the
population.
•It is not possible to draw conclusions about the total population
based on mathematical, statistical methods.
•Often used in smaller-scale surveys.
•PROBABILITY SAMPLING
•The probablity of selection is the same for all members of the
population.
•It is possible to draw conclusions about the total population
based on mathematical, statistical methods.
•Often used in large-scale surveys.
Nonprobabilty sampling
1. Reliance on Available Subjects
2. Judgmental Sampling
