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What is the difference between quota sampling and cluster sampling
Sampling error leads to random error. Sampling bias leads to systematic error.
http://www.ma.utexas.edu/users/parker/sampling/repl.htm
in flat top sampling the electronic circuit required for sampling are less complicated as compared to the one used in natural sampling, at demodulation of the sample it is very difficult to maintain the natural waveform of the natural sampling so flat top sampling can easily be demodulated.
Random sampling is picking a subject at random. Systematic sampling is using a pattern to pick subjects, I.e. picking every third person.