Simple random sampling – In this sampling method, each item in the population has an equal probability of getting selected in the sample. First, you must assign a unique identifier to each item.

Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test samples.

A random sample is a group or set chosen from a larger population—or group of factors of instances—in a random manner that allows for each member of the larger group to have an equal chance ...