simple random sampling method
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The answer depends on the underlying variance (standard deviation) in the population, the size of the sample and the procedure used to select the sample.
The chief aim is to find a representative sample; that is, a sample which reflects the properties of the population, as a whole.
the participants are representative of the population they are interested in studying
a stratified random sample
simple random sample is to select the sample in random method but systematic random sample is to select the sample in particular sequence (ie 1st 11th 21st 31st etc.)• Simple random sample requires that each individual is separately selected but systematic random sample does not selected separately.• In simple random sampling, for each k, each sample of size k has equal probability of being selected as a sample but it is not so in systematic random sampling.