sampling

Question 1

define random sampling

Answer 1

every member of the target population has equal chance of being selected for the sample

Question 2

advantages of random sampling

Answer 2

lacks bias
simplicity

Question 3

disadvantages of random sampling

Answer 3

not accessible to a larger population
not time efficient
costs
needs data

Question 4

define systematic sampling

Answer 4

every nth member of the target population is selected

Question 5

advantages of systematic sampling

Answer 5

unbiased

Question 6

disadvantages of systematic sampling

Answer 6

greater risk of data manipulation
human error

Question 7

define stratified sampling

Answer 7

sampler divides the target group into sections each showing a key characteristic which should be present in the final sample
- target population is divide into subgroups and are equally represented in the final sample

Question 8

advantages of stratified sampling

Answer 8

equally represented
reduces sampling error

Question 9

disadvantages of stratified sampling

Answer 9

need prior knowledge
not always accurate , so can be biased
time

Question 10

define opportunity sampling

Answer 10

researcher uses participants who are accessible and willing to take part

Question 11

advantages of opportunity sampling

Answer 11

easy
inexpensive

Question 12

disadvantages of opportunity sampling

Answer 12

not representative as it can be subject to bias

Question 13

define volunteer sampling

Answer 13

participants self select themselves eg sign up

Question 14

advantages of volunteer sampling

Answer 14

large reach , wide audience

Question 15

disadvantages of volunteer sampling

Answer 15

volunteers may all display similar characteristics , unrepresentative .