# STATISTICS: REVISION CARDSP2

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What is a census?
A census is a official survey of all the members of the population
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What is a sample?
A small appropriate amount of people or things to be surveyed
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What is an sample frame?
A list or map of all the members of the population
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What is the main disadvantage of using sample data?
It does not include every member of the population
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Give two ways you can minimise bias results.
By sampling the correct population and using a random sample
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What is simple random sampling?
Simple random sampling is where everything has an equal chance of being chosen e.g. like a lottery
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Explain the process of random sampling
Number everything/person, then choose these numbers by placing them in a box and selecting the number randomally.
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Advantage: Every member of the population has an equal chance of being selected, so it's completely unbiased. Disadvantage: It's not always practical or convenient e.g if the population spread is over a large area, the researcher will have to travel.
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What is stratified sampling?
Stratified sampling is samples taken from every/different categories.
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ADVANTAGE: If you have easy to define categories in the population. DISADVANTAGE: It can be expensive because, of the extra detail involved.
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What is systematic sampling?
Systematic sampling is every nth number is taken from the sampling frame
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ADVANTAGES: This should produce an unbaised sample and can be carried out by a machine. DISADVANTAGES: The nth item might coincide with a pattern which will make it biased
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What is cluster sampling
Cluster sampling is where random sample of clusters is chosen and then, every member in those clusters is included in your sample.
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ADVANTAGE: It's fairly convenient - can save a lot of travel time when the - population is spread over a large area. DISADVANTAGE: It's easy to get a biased result
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What is quota sampling often used for?
It is often used in market research
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## Other cards in this set

### Card 2

#### Front

What is a sample?

#### Back

A small appropriate amount of people or things to be surveyed

### Card 3

#### Front

What is an sample frame?

### Card 4

#### Front

What is the main disadvantage of using sample data?

### Card 5

#### Front

Give two ways you can minimise bias results.