Statistics and Probability Dictionary
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Simple Random Sampling
Simple random sampling refers to any sampling method that has the following
The population consists of N
The sample consists of n
If all possible samples of n objects are equally likely to occur, the
sampling method is called simple random sampling.
An important benefit of simple random sampling is that it allows researchers to use
statistical methods to analyze sample results. For example, given a simple random
sample, researchers can use statistical methods to define a
confidence interval around a sample mean. Statistical
analysis is not appropriate when non-random sampling methods are used.
There are many ways to obtain a simple random sample. One way would be the
lottery method. Each of the N population members is assigned a unique
number. The numbers are placed in a bowl and thoroughly mixed. Then, a
blind-folded researcher selects n numbers. Population members having the
selected numbers are included in the sample.