Sampling

Question 1

SRS positives

Answer 1

free of bias, easy + cheap for small samples

Question 2

SRS negatives

Answer 2

sampling frame needed, too expensive + time-consuming if sample size is too large

Question 3

Systematic positives

Answer 3

simple and quick, suitable for large samples

Question 4

Systematic negatives

Answer 4

sampling frame needed, if frame is not random there may be bias

Question 5

Stratified positives

Answer 5

accurately reflects population structure, guarantees proportional representation of groups within population

Question 6

Stratified negatives

Answer 6

population must be clearly classified into distinct strata, selection within strata has same negs as SRS

Question 7

Quota positives

Answer 7

small sample can still represent population, easy + cheap + no sampling frame needed, allows comparison between groups within population

Question 8

Quota negatives

Answer 8

division into groups may be inaccurate, non-random so may introduce bias

Question 9

Opportunity positives

Answer 9

easy, efficient, cheap

Question 10

Opportunity negatives

Answer 10

unlikely to provide a representative sample, non-random may mean bias