sampling methods

Question 1

What is random sampling?

Answer 1

Probability sample, everyone has equal chance

Question 2

What is stratified sampling?

Answer 2

Works out the different types of people that make up their target population and then works out proportions for it to be representative

Question 3

What is opportunity sampling?

Answer 3

Where the researcher chooses participants based on their proximity rather than using a random or systematic method

Question 4

What is systematic sampling?

Answer 4

every nth individual is selected from a list or sequence to form a sample

If you take every nth name, you will get a systematic sample of the correct size. If, for example, you wanted to sample 150 children from a school of 1,500, you would take every 10th name.

Question 5

The advantage and disadvantage of random sampling?

Answer 5

Eliminate sampling bias

difficult to achieve (time,effort,money)

Question 6

The advantage and disadvantage of stratified sampling?

Answer 6

Highly representative of target population so generalisable

Gathering such a sample would be really time consuming to do

Question 7

The advantage and disadvantage of opportunity sampling?

Answer 7

Quick and easy

May not provide a representative sample and could show bias

Question 8

The advantage and disadvantage of systematic sampling?

Answer 8

Should provide a representative sample

it is very difficult to achieve (time effort money)