Sampling Technique

Question 1

What is random sample? AO1

Answer 1

Every person in the target population has an equal chance of being selected

Question 2

How? Random sample AO1

Answer 2

Random allocation
Create a list of all the target pop write names on equal size pieces of paper put it in a hat without looking select the number u want in your sample

Question 3

A03 strength? Random sample

Answer 3

Unbiased= everyone in the study has an equal chance of being selected
Increase internal validity

Question 4

AO3 limitation? Random sample

Answer 4

Time consuming= takes time and can be difficult collecting all names of ppt to take part and not guaranteed ppt would take part

Question 5

What’s systematic sample? aO1

Answer 5

A system is applied to select ppt

Question 6

How? Systematic sample AO1

Answer 6

-Create sampling frame to organise the target population e.g put in alphabet order
- decide on system e.g every 5th or 10th person is chosen until there are enough

Question 7

A03 strength? Systematic sample

Answer 7

Avoids researcher bias=researcher no influence over who chosen

Question 8

A03 limitation? Systematic sample

Answer 8

Sample not be representative= not everyone got equal chance to being picked out.
- difficult to generalise to target pop
- time consuming and difficult for researcher

Question 9

What is opportunity sample AO1

Answer 9

Being there at the moment in time

Question 10

How? Opportunity sample AO1

Answer 10

Go somewhere you will have access to the population u want to study and ask the first 30 ppt who are there

Question 11

A03 strength? Opportunity sample

Answer 11

Very quick easy and less money required

Question 12

A03 limitation? Opportunity sample

Answer 12

May not be representative of the target pop
As they are present in the same place
- they may have similar personalities making it difficult to generalise findings to wider pop

Question 13

What’s volunteer sample? AO1

Answer 13

Self selected method where ppl volunteer themselves to be ppt

Question 14

How? Volunteer sample AO1

Answer 14

Place an advert where ppl in the target pop will see it and wait for the first 30

Question 15

A03 strength? Volunteer sample

Answer 15

Very quick easy and cheap to conduct

Question 16

AO3 limitation? Volunteer sample

Answer 16

Sample maybe bias/ nor rapresentative as only certain type of personality would volunteer (extroverted/ curious )

Question 17

What’s Stratified sample AO1?

Answer 17

Advanced way of sampling where the make-up of the sample reflects the proportion of sub group in target pop

Question 18

How? Stratified sample AO1?

Answer 18

1 identify the diff subgroup
2 calculate how many of each proportion u would need for ur sample
3 n of ppt are chosen using random sampling

Question 19

Calculation if percentage is given? Stratified sample

Answer 19

(Sample size wanted/100) x percentage size of subgroup

Question 20

Calculation if percentage is not given
Stratified sample

Answer 20

(sample size wanted/ target pop size) x subgroup size

Question 21

Calculation if percentage is not given
Stratified sample

Answer 21

(sample size wanted/ target pop size) x subgroup size

Question 22

A03 strength? Stratified sample

Answer 22

Most representative sample as it accurately reflects the make-up target pop in correct amounts meaning findings can be generalised to target pop

Question 23

AO3 limitation? Stratified sample

Answer 23

Very time consuming= because it takes time working out the proportions of ppt needed
- not guaranteed ppt would consent take part