Sampling

Question 1

What is a simple random sample?

Answer 1

Each member of population has equal chance of being picked

Question 2

Give one simple random sample pro

Give two simple random sample cons

Answer 2

Equal chance means each member has fair representation.

• Outliers = included
• Expensive (travelling costs)

Question 3

What is a cluster sample? (3 things)

Answer 3

Population is divided into groups (clusters)
Some clusters are selected using S.R.S
All members of selected clusters are sampled

Question 4

What is one cluster sample pro?

Give two cluster sample cons?

Answer 4

Less costly

• Outliers are included in selection
• Cluster may not be representative of total population

Question 5

What is a stratified sample? (3 THINGS)

Answer 5

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 a simple random sample

Question 6

What is one stratified sample pro?

Answer 6

Size of sample is in proportion to size of stratas

-Expensive