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Chapter 11 - Sampling, Data Representation and Interpretation
Fichas del conjunto (19)
- 1What is a census?A survey of the whole population
- 2What are the advantages and disadvantages of a census?Advantages - not biased
Disadvantages - very large and expensive - 3What is a sample?A smaller group from the population
- 4What are the advantages and disadvantages of a sample?Advantages - Quicker and cheaper
Disadvantages - can be biased and not representative - 5What is a simple random sampling method?Give a number to each population member and then randomly generate a set of numbers using an app
- 6What are the advantages and disadvantages of simple random sampling?Advantages - Equal chance and unbiased
Disadvantages - inconvenient - 7What is a systematic sampling method?Every nth term
- 8What are the advantages and disadvantages of systematic sampling methods?Advantages - Can be done by a machine
Disadvantages - Could be biased if the pattern is not random - 9What is a stratified sampling methodDivide the population into categories
calculate the number needed using the formula:
(size of category/total size of population) x total sample size
Randomly select the sample for each category - 10What are the Advantages and Disadvantages of stratified sampling?Advantages - no overlap and useful categories
Disadvantages - expensive - 11What is a Quota Sampling method?Divide the population into categories
Give each category a quota
Collect data until quotas are met in all categories (no random sampling) - 12What are the advantages and disadvantages of Quota sampling?Advantages - easy and don't need access to the whole of the population
Disadvantages - biased and excludes part of the population - 13What is a Opportunity sampling method?Choose the members of the population who are the easiest (first people to arrive)
- 14What are the advantages and disadvantages of opportunity sampling?Advantage - Quick and easy
Disadvantage - Isn't random and is very biased - 15What is a Cluster Sampling method?Divide the population into clusters (no member belongs to multiple clusters)
Randomly select clusters to use bin the sample based on required sample size
Either randomly select people in that cluster or use whole cluster - 16What are the advantages and disadvantages of cluster sampling?Advantage - Practical and adaptable
Disadvantage - Less representative and there is not always a way to cluster the populations in a natural way - 17What is a Self-Selection sampling method?Volunteers
- 18What are the advantages and disadvantages of Self-selecting sampling?Advantage - little time, effort and may be the only way
Disadvantage - trends and strong opinions - 19How do you calculate frequency density?frequency/class width
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- A level Maths Fichas sobre Chapter 11 - Sampling, Data Representation and Interpretation, creado por Jess Todd el 23/03/2022.
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- Jess Todd
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