ISDS 361B Ch. 5
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How do you collect data.... where does data come from?
What are 2 sampling plans?
- Stratified Random Sampling
- Cluster Sampling
Stratified Random Sampling
Divide and put population into categories and then take random samples from each.
Random sample of groups or clusters
take a sample to represent the population
What are the 2 errors that can arise when taking samples?
- Sampling Error
- Nonsampling Error
Error we expect when making a statement of population based on sample
Ex: Difference between the true (unknown) value of the pop. mean and its estimate (sample mean) is sampling error
Mistakes made from taking the wrong information
Ex: Recording incorrect responses.
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