sampling methods

Question 1

strength of random sampling

Answer 1

likely to be representative, can be generalised to whole population

Question 2

weakness of random sampling

Answer 2

-difficult and time consuming to get full details of target pop
-people selected may be unwilling to take part

Question 3

strength of systematic

Answer 3

not subject to researcher bias as numerical value is assigned to each person on a given list, without any personal preference from researcher

Question 4

weakness of systematic

Answer 4

not truly unbiased as very nth person selected may have a similar trait in common and therefore will not be representative of wider population

Question 5

strength of stratified

Answer 5

likely to be representative as each subsection of target population is proportionately represented, results can be generalised

Question 6

weakness of stratified

Answer 6

• difficult and time consuming to identify subgroups
• people selected may be unwilling to take part

Question 7

strength of opportunity

Answer 7

quicker and easier to obtain in comparison to other methods

Question 8

weakness of opportunity

Answer 8

high chance of sample will be biased e.g. available uni students not representative of whole population

Question 9

strength of volunteer

Answer 9

quicker and easier to obtain in comparison to other methods

Question 10

weakness of volunteer

Answer 10

particular type of person likely to take part in the research (and only those who see advert), therefore sample is biased