Sampling

Question 1

What are the types of sampling

Answer 1

Random
Systematic
Stratified
Opportunity
Volunteer

Question 2

Whats a random sample

Answer 2

Every person in the target population has an equal chance of being selected. It does this by giving everyone in the target population a number and them using a random number generator, to pick participants

Question 3

strengths and limitations of ranodm sampling

Answer 3

Strengths = unbiased, CV and EVs are controlled and no researcher bias, increase internal validity

Limitations = time consuming, it will be Tim consuming it create a list of the whole target population and some particpants might refuse to take part

Question 4

Whats systematic sampling

Answer 4

Participant’s are picked using a set ‘pattern’. The first participant will be picked randomly then the nth participant from the list.

Question 5

strengths and limitations of systematic sampling

Answer 5

Strengths = unbiased, the laws of probability would suggest that the sample should ve overall representative of the whole target population
Strengths = reduced researcher bias, the researcher isn’t picking the particpants themselves

Limitations = Time consuming, a list of the whole population os required

Question 6

Whats is stratified sampling

Answer 6

It involves splitting the population into subgroups, then randomly selecting particpants from the subgroups, in proportion to what they actually occur in the population

Question 7

strengths and limitations of stratified sampling

Answer 7

Strengths = most representative sample because the characteristics of the target population are represented, can be generalised
Strength = reduced researcher bias

Weakness = time consuming to make the subgroups
Weakness = doesn’t provide you with a complete representative sample, as some proportions ma be incorrect as people can’t reflect in the same way, complete representation isn’t possible

Question 8

What is opportunity sampling

Answer 8

Obtaining the people who are the nearest/easiest to obtain

Question 9

strengths and limitations of opportunity sampling

Answer 9

Strength = quick, convenient because you are asking the closest people, cheap and quick

Limitation = not representative of the whole population because they are only using people who are available

Question 10

What is volunteer sample

Answer 10

This is when particpants select themselves by responding to an advertisement for a study

Question 11

strengths and limitations of volunteer sampling

Answer 11

Strength = participants are willing, due to them selecting themselves they are going to b participate with full potential, more likely to engage

Limitation = volunteer bias, particpants may share the same traits, generalisation will be limited