Maths - Sampling methods

Population

Split via characteristics

Take a random sample

Continue?

Simple random

Random must've been in first set of k, plus k to get to next sampling unit

Systematic

Select random from each characteristic until quota is met?

Calculate proportion of population

Stratified

Interviewer chooses until quota is met?

Quota Sampling

Sample taken from people available at time of study

Opportunity/ Convienience sampling

No

Yes