Sampling Technique-Non Probability Sampling: Non-probability sampling is a sampling technique where the samples are gathered in a process that does not give all the individuals in the population equal chances of being selected. It also Covers Types of Non-Probability Sampling and its Utility.

1. Sampling Technique-Non Probability
Sampling

4. Non Probabilty Sampling
• Not every element of the population has the opportunity for selection in
the sample
• Does not give all of the individuals in the population equal chances of
being selected.
• No sampling frame
• Population parameters may be unknown
• Non-random selection
• More likely to produce a biased sample
• Restricts generalization

14. Judgment Sampling
• Authoritative sampling/purposive sampling.
• Researcher selects units to be sampled based on his own
existing knowledge, or his professional judgment.
• Choice of sample items depends exclusively on the judgment
of the investigator
• No sampling frame
• Population parameters may be unknown
• Non-random selection
• More likely to produce a biased sample
• Restricts generalization

16. Judgment Sampling –When to use
• Most effective when only a limited number of
individuals possess the trait that a researcher is
interested in.
• Focus only on the members of the population that
fit the criteria and interests of their study

18. Judgment Sampling –Disadvantages
• This method is not scientific because the
population units to be sampled may be affected by
the personal prejudice or bias of the investigator
• There is no objective way of evaluating the
reliability of sample results.