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AQA Core Maths > Sampling > Flashcards

Flashcards in Sampling Deck (6)
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1

What is a simple random sample?

Each member of population has equal chance of being picked

2

Give one simple random sample pro
Give two simple random sample cons

Equal chance means each member has fair representation.

-Outliers = included
-Expensive (travelling costs)

3

What is a cluster sample? (3 things)

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

4

What is one cluster sample pro?
Give two cluster sample cons?

Less costly

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

5

What is a stratified sample? (3 THINGS)

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

6

What is one stratified sample pro?

Size of sample is in proportion to size of stratas

-Expensive