population and sampling

What is a population?

The whole set of items that of inerest

What is an element?

An individual data point or observation within a dataset.

What is a sample?

A selection of observations take from the population

What is strata?

Divisions within a population based on certain characteristics or attributes shared by the individuals or items in each subgroup

What is a census

measures every member of a population

What is a sampling unit

An individual of the population

What is a sampling frame

a list of the items or people forming a population from which a sample is taken

what is simple random sampling

every member of the population has the same probability of being selected

what is systematic sampling

ask every xth person (selecting members of a population at regular intervals)

what is stratified sampling

split into groups, take a certain amount of people from each group

what is quota sampling

split into groups, take the same number of people from each group

what is opportunity sampling

ask the first x people you come across