A Census is the type of survey for a complete population. A Sample Survey is only a portion of the population which is used to make predictions on the representation of the actual population.
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What is the difference between the population and sample regression functions? Is this a distinction without difference?
random sample is a big sample and convenience sample is small sample
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A sample is any subset of the total population. A representative sample is one that is chosen so that its characteristics are similar to that of the population.
The main difference is that the way of selecting a sample Random sample purely on randomly selected sample,in random sample every objective has a an equal chance to get into sample but it may follow heterogeneous,to over come this problem we can use stratified Random Sample Here the difference is that random sample may follow heterogeneity and Stratified follows homogeneity