Sampling in maths (wip) Flashcards
1
Q
What are the three types of random sampling?
A
- Simple random sampling
- Systematic sampling
- Stratified sampling
2
Q
What are the advantages of simple random sampling?
A
- Free of bias
- Easy and cheap to do for small populations / small samples
3
Q
What are the disadvantages of simple random sampling?
A
- Simple random sampling is not suitable when the population / sample size is too large, as it is too time consuming and expensive.
- A sampling frame is required.
4
Q
What is systematic sampling?
A
The required elements are chosen at regular intervals from an ordered list.
5
Q
What are the advantages of systematic sampling?
A
- Simple and quick
- Suitable for large samples / populations
6
Q
What are the disadvantages of systematic sampling?
A
- A sampling frame is needed.
- Bias can be introduced if the sampling frame is not random.
7
Q
What is stratified sampling?
A
The population is divided into mutually exclusive strata, and a random sample is taken from each.
8
Q
What are the advantages of stratified sampling?
A
- The sample accurately reflects the population structure.
- Guarantees proportional representation of groups within a population.
9
Q
What are the disadvantages of stratified sampling?
A
- The population must be clearly classified into distinct strata.
- A sampling frame is required.
10
Q
What is quota sampling?
A
