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13 Cards in this Set
- Front
- Back
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Simple random sampling |
Probability of being sampled or not is equal for everyone |
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Stratified random sampling |
quite different sub populations Divide into groups Each observation belongs to one stratum Alike as possible Combined to form a full sample Weighted sampling |
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Cluster sampling |
Representation of small scale of population Geographic type of sampling |
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Convenience sampling |
Non probabilistic Free and easy Most likely biased |
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Judgement sampling |
A person who is knowledgeable will select Easy and cheap Dependent on that person |
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Binomial distribution |
Consist of n identical trials Exactly two possible outcomes Independent of each other Outcomes remain constant |
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Uniform distribution |
All intervals same length equal probable |
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Standardized normal distribution |
Work around of normal Z distribution |
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Poisson distribution |
How many times something happens in a time period |
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Pmf |
Probability mass function |
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Geometric distribution |
How many times until something happens Memoryless property |
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Hypergeometric distribution |
Random experiment without replacement |
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Exponential distribution |
How much time before something happens How much time before someone dies |
