Stratified sample

Question 1

Stratified sample

Answer 1

Population split into groups with same characteristics (strata)
Number of members selected = proportional to strata’s size
Strata’s members = then selected using a simple random sample

Question 2

Stratified sample

Answer 2

Population split into groups with same characteristics (strata)
Number of members to be selected from each strata = proportional to its size
Those members are then selected using S.R.S