Sampling Methods Flashcards

1
Q

Descibe simple random sampling

A

Every member of population is equally likely to be chosen. For example, allocate each member of population a number. Then use random generator to get a sample of the desired size.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

State 2 pros of the simple random sampling

A
  • Bias free

- Easy and cheap to implement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

State 2 cons of the simple random sampling

A
  • Not suitable when population size is large

- Sampling frame is needed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Describe systematic sampling

A

pick random number between 1-10, and take n’th number

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

State 2 pros of systematic sampling

A
  • Simple and quick to use

- Suitable for large populations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

State 2 cons of systematic sampling

A
  • Sampling frame needed

- Can introduce bias if sampling frame not random

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe stratified sampling

A

when population naturally divides into groups, split the population into these groups and then sample same proportion(sample/population) in each group

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

State 2 pros of stratified sampling

A
  • Reflects population structure

- Guarantees proportional representation of groups within population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

State 1 cons of stratified sampling

A

-Population must be classified in distinct strata

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Describes opportunity sampling

A

Take samples from members of the population you have access to until you have a sample of the desired size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

State 2 pros of opportunity sampling

A
  • Easy to carry out

- Inexpensive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

State 2 cons of opportunity sampling

A
  • Unlikely to provide a representative sample

- Dependant on individual research

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe quota sampling

A

Population is divided into groups depending on characteristic. Decide how many members of each group you wish to sample and use opportunity sampling until you have a large enough sample for each group

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

State 1 pros of quota sampling

A

-Allows for early comparison between different groups in groups

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

State 2 cons of quota sampling

A
  • Can take time

- Non responses are not recorded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly