DEFINITION of 'Simple Random Sample'
A subset of a statistical population in which each member of the subset has an equal probability of being chosen. A simple random sample is meant to be an unbiased representation of a group. An example of a simple random sample would be a group of 25 employees chosen out of a hat from a company of 250 employees. In this case, the population is all 250 employees, and the sample is random because each employee has an equal chance of being chosen.
INVESTOPEDIA EXPLAINS 'Simple Random Sample'
A sampling error can occur with a simple random sample if the sample doesn't end up accurately reflecting the population it is supposed to represent. For example, in our simple random sample of 25 employees, it would be possible to draw 25 men even if the population consisted of 125 women and 125 men. For this reason, simple random sampling is more commonly used when the researcher knows little about the population. If the researcher knew more, it would be better to use a different sampling technique, such as stratified random sampling, which helps to account for the differences within the population (such as age, race or gender).

Population
The entire pool from which a statistical sample is drawn. The ... 
ZTest
A statistical test used to determine whether two population means ... 
Statistical Significance
A result that is not likely to occur randomly, but rather is ... 
Sampling Distribution
A probability distribution of a statistic obtained through a ... 
Probability Distribution
A statistical function that describes all the possible values ... 
NonSampling Error
A statistical error caused by human error to which a specific ...
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