Sampling Principles refer to the methods used to gather data from a subset or group of people.
A Sample refers to any group of people or items selected from a population. A Population refers to the whole group of people or items being studied.
A Census refers to a survey of all members of a population.
Bias refers to error resulting from choosing a sample that does not represent the whole population.
Simple Random Sampling refers to the process of choosing a specific number of members randomly from the entire population.
Systemic Random Sampling refers to the process of choosing members of a population at fixed intervals from a randomly selected member.
Stratfied Random Sampling refers to the process of dividing a population into distinct groups and then choosing the same fraction of members from each group.
Non-Random Sampling refers to the process of using a method that isn't random to choose a sample from a population.