What is sample?

Sample is:
 A subset of the population. As discussed in the previous post, sample is used for:
– Practical considerations
– Time considerations

There are generally two types of sampling:

1. Probability sampling - random – Robust as random sampling allows selection of representative samples 
2. Non-probability sampling - non random – Less robust but might be the most appropriate for some of the studies where random sampling is not possible  
   

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