Sampling methods

Question 1

What is a census?

Answer 1

Where every member of the population is sampled

Question 2

What are the advantages of a census?

Answer 2

It is unbiased

Question 3

What are the disadvantages of a census?

Answer 3

It can take a long time to sample every member of the population
It can be costly/expensive
It is hard to guarantee every member will respond

Question 4

What is simple random sampling?

Answer 4

A random number generator is used to select a sample from a numberd list of the population. (Ignoring repeats)

Question 5

What is systematic sampling

Answer 5

Select a starting point, n, (Using a random number generator) and sample every nth person until you reach your sample size.

Question 6

What is stratified sampling?

Answer 6

When your population splits into distinct groups (E.g year groups) and you sample a proportion from each group

Distinct group = They do not overlap

Question 7

What is cluster sampling?

Answer 7

When groups split into clusters (E.g classes in a college) And you can sample each cluster/take a sample from within that cluster

Question 8

What is oppourtuity/convieince sampling

Answer 8

E.g Sampling those who walk past you

Question 9

Quota sampling

Answer 9

Where a quota (certain number) is required for each group. So you keep sampling until each sample is met.

Question 10

What is self-selection/Volunteer sampling

Answer 10

Where people can choose to take part in the survey. E.g responding to a questionaire.

Question 11

What is an advantage of simple random sampling

Answer 11

Simple random surveys are quicker and easier than a cencus