Systematic And Cluster Sampling Flashcards
What is systematic sampling
Choosing every nth term
When can you use systematic sampling
If population is very large
How does systematic sampling work
Choose a random starting point and then take a sample at regular intervals afterwards
Why is systematic sampling good for quality control checks on a mass production line
You can set machines to sample every nth term
Pros of systematic sampling
Systematic sampling should produce am unbiased sample and can be carried out by a machine
Cons of systematic sampling
The nth term item chosen might concide with a pattern
What does cluster sampling do
Randomly samples groups
What are clusters
Smaller groups in a population often based in criteria such as location
What is cluster sampling
Where a random sampling,e of clusters is chosen and every member in those clusters is included in your sample
What do you need for cluster sampling
A list of clusters and list of all the members in the clusters
What means there is lees bias in a sample
If the distribution of all the menders within the cluster is close to the whole population
Pros of cluster sampling
Convenient can save on travel time and spread over large areas
Cons of cluster sampling
Easy for samples to be biased
People in similar postal districts may have similar incomes or employment
Or if the sample clusters are Similar to each other you may get a biased result
