METHODS OF DATA COLLECTION
CONCEPT OF SAMPLING AND OTHER CONCEPTS RELATED TO SAMPLING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It involves convenience sampling methods.
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Identifying clusters in a population is not possible.
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It limits a sample to individuals in the chosen clusters.
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It applies a random sampling method to select participants in each cluster.
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Detailed explanation-1: -The method is prone to biases. If the clusters representing the entire population were formed under a biased opinion, the inferences about the entire population would be biased as well.
Detailed explanation-2: -Cluster sampling is a sampling used when in a statistical population there are mutually homogeneous yet internally heterogeneous groups. In this sampling plan, the total population is divided into these groups and a simple random sample of the groups is selected.
Detailed explanation-3: -When cluster sampling is used the effect of intra-cluster correlation (ICC, or the strength of correlation within clusters) must be regarded for sample size calculation. 2. This effect called the design effect (Deff). It is a correction factor that is used to adjust the required sample size for cluster sampling.