sampling methods

Question 1

random sampling

Answer 1

every person from target population has an equal chance of being picked for sample

Question 2

strength of random sampling

Answer 2

• representative sample
• generalisable results
• all members have an equal chance of being chosen

Question 3

weakness of random sampling

Answer 3

• time consuming
• impractical

Question 4

systematic sampling

Answer 4

members of target population are selected systematically

Question 5

strength of systematic sampling

Answer 5

• unbiased selection increases chance of achieving representative sample
• generalisable results

Question 6

weakness of systematic sampling

Answer 6

• periodic traits ( traits shared by every person) can result in unrepresentative results

Question 7

stratified sampling

Answer 7

• proportional representation of target population thats being selected
• reflects the proportions of certain sub groups within population e.g age gender

Question 8

strength of stratified sampling

Answer 8

• representative of population
  -unbiased

Question 9

weakness of stratified sampling

Answer 9

• time consuming
• difficult to do as knowledge of population is required

Question 10

opportunity sampling

Answer 10

• sampler selects p from whoever is alavaliable at the time

Question 11

strength of opportunity sampling

Answer 11

convenient
easy and quick

Question 12

weakness of opportunity sampling

Answer 12

unrepresentative sample, leads to results that aren’t generalisable

Question 13

volunteer sampling

Answer 13

p put themselves forwards to be in a sample

Question 14

strength of volunteer sampling

Answer 14

p would be very motivated
easy to do

Question 15

weakness of volunteer sampling

Answer 15

• un represerative sample as likely to be biased
• demand characteristics