Sampling

Question 1

Opportunity sampling

Answer 1

using the people around you e.g. asking people walking past you in the street

Question 2

Volunteer sampling

Answer 2

e.g. advertise in a newspaper

Question 3

Random sampling

Answer 3

each member of the population has a random chance of being selected e.g. the lottery, drawing names or numbers out of a hat

Question 4

Stratified sampling

Answer 4

Subgroups (strata) identified e.g. boys or girls, a certain age range)

P’s obtained from each group in proportion to occurrence in population

e.g. if have 100 boys and 90 girls in a population, might have 10 boys and 9 girls in sample

Selected form strata using random sampling

Question 5

Systematic sampling

Answer 5

Use predetermined system to select p’s e.g. every 6th, 14th etc person from a phone book