Random sample and Sample distribution

Random sample noun - A sample in which every element in the population has an equal chance of being selected.

Sample distribution and random sample are semantically related. In some cases you can use "Sample distribution" instead a noun phrase "Random sample".

Sample distribution noun - Items selected at random from a population and used to test hypotheses about the population.

Random sample and sample distribution are semantically related. Sometimes you can replace phrase "Random sample" with "Sample distribution", this phrases are similar.