Because without representative sample, your results will not be valid.
Take a simple random sample.
Well, if your sample does not represent the larger sample, you'll certainly not get a valid result ... For example, if you're studying pregnancy and your sample includes men - The whole idea of "representative' sample is fuzzy and often gives interesting errors.
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.
It is important for a sample to be representative, so that the whole population's view is counted, and not biased by one particular group within the population.
Many statistical statements for a population which are based on a sample are not valid if the sample is not representative.
A representative sample is a randomly selected subset of the population.
Because without representative sample, your results will not be valid.
A simple random sample.
A sample is any subset of the total population. A representative sample is one that is chosen so that its characteristics are similar to that of the population.
It is called a representative sample.
That the key characteristics of the population are reflected in the sample.
Take a simple random sample.
Well, if your sample does not represent the larger sample, you'll certainly not get a valid result ... For example, if you're studying pregnancy and your sample includes men - The whole idea of "representative' sample is fuzzy and often gives interesting errors.
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.
.representative
(adjective) The sample is representative of the specimens we gathered. (noun) We will send a representative to the student council meeting.