ISDS 361B Ch. 5

How do you collect data.... where does data come from?
- Observation
- Experiment
- Survey
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.
Cluster Sampling

Random sample of groups or clusters
Sampling

take a sample to represent the population
What are the 2 errors that can arise when taking samples?
- Sampling Error
- Nonsampling Error
Sampling 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
Nonsampling Error

Mistakes made from taking the wrong information

Ex: Recording incorrect responses.

Author

39498

Card Set

ISDS 361B Ch. 5

Description

Data Collection and Sampling

Updated

2010-10-04T03:46:53Z

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