Sampling (2)

Question 1

Simple random sampling

Answer 1

Generate 100 random numbers, select 10. Pick again if there are any repeats

Can be costly if employed on a large scale

Question 2

Generate 100 random numbers, select 10. Pick again if there are any repeats

Can be costly if employed on a large scale

Answer 2

Simple random sampling

Question 3

Systematic sampling

Answer 3

Picking every nth of something.

Picking every nth product with a fault in

Question 4

Picking every nth of something.

Picking every nth product with a fault in

Answer 4

Systematic sampling

Question 5

Stratified sampling

UK:45, US:105, pick 30 people

Answer 5

45/150 * 30 = 9
105/150 * 30 = 21

Then utilise systematic or simple random sampling to pick those people from the groups

Question 6

Advantage of stratified sampling

Answer 6

Focus attention on particular areas if that has an influence on questionnaire results

Question 7

Focus attention on particular areas if that has an influence on questionnaire results

Answer 7

Advantage of stratified sampling

Question 8

Quota sampling

Answer 8

In a sample, I required a certain number of people with a certain characteristic. Is cost effective, but depends on who I find

Question 9

In a sample, I required a certain number of people with a certain characteristic. Is cost effective, but depends on who I find

Answer 9

Quota sampling

Question 10

Opportunity sampling

Answer 10

Making sampling easier for myself. e.g. standing in the street with a clipboard to gain quick responses

Question 11

Making sampling easier for myself. e.g. standing in the street with a clipboard to gain quick responses

Answer 11

Opportunity sampling

Question 12

Cluster sampling

Answer 12

Splitting those samples into clusters. e.g. each tesco store being represented as a cluster. Every 10 employees in a store.

Relatively easy, differences in a location

Question 13

Splitting those samples into clusters. e.g. each tesco store being represented as a cluster. Every 10 employees in a store.

Relatively easy, differences in a location

Answer 13

Cluster sampling

Question 14

Self-selection sampling

Answer 14

Filling out a survey online for people to fill out.

Cost effective, responses may not be accurate

Question 15

Filling out a survey online for people to fill out.

Cost effective, responses may not be accurate

Answer 15

Self-selection sampling