Problem 905

Simple random sampling:-

We choose a sample of items in such a way that every sample of a given size has an equal chance of being selected.


Systematic sampling:-

We use a simple system to choose the sample, such as selecting every 10th or every 50th member of the population.


Convenience sampling:-

We use a sample that is convenient to select, such as people who happen to be in the same classroom.


Stratified sampling:-

We use this method when we are concerned about differences among subgroups, or strata, within a population. We first identify the subgroups and then draw a simple random sample within each subgroup. The total sample consists of all the samples from the individual subgroups.


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