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Sampling
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Key Concepts:
Terms in this set (12)
What are the three methods of random sampling?
Simple, stratified and systematic
What is simple random sampling?
Sample size of n is one where every sample of size n has an equal chance of being selected
What sampling frame do you need for simple random sampling?
A list of people or things
What are the two methods of choosing the numbers?
Using a calculator or computer or random number table
What is stratified random sampling?
Population is divided into mutually exclusive strata and a random sample is taken from each.
What is the formula for stratified sampling?
Number in stratum/ number in population x overall sample size
What is systematic random sampling?
Required elements are chosen at regular intervals from an ordered list
What are the advantages of simple random sampling?
It is free of bias, easy and cheap for small populations and small samples and each sampling unit has a known and equal chance of selection
What are the disadvantages of simple random sampling?
Not suitable when sampling or population size is large because it is time consuming, disruptive and expensive, sampling frame is needed
What are the advantages of systematic sampling?
Simple and quick and suitable for large samples and large populations
What are the disadvantages of systematic sampling?
Sampling frame is needed and it can introduce a bias if the sampling frame is not random
What are the advantages of stratified sampling?
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