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15 Cards in this Set
- Front
- Back
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Target population
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who we are shooting for
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Sample Population
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who we ask
subset of the population |
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Sample
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who responded
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Biased Sample
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not every member has an equal chance
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Selection Biased Sample
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some member have unequal chance
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Quota Sampling
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Uses quotas to force sample to be representative of the population
not random |
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Simple- Random Sampling
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any group of individuals in a population have the same chance of being in the sample
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Stratified Sampling
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uses several layers of strata a chooses sample by random selection within each layer
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capture/recapture equation
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capture/unknown recapture/total
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If two sets of data points are correlated, then on event must cause the other
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false
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locator
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L= (p/100)N
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Interquartile Range
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IQR= Q3-Q1
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Variance
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for each point compute (number- median)^2
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standard deviation
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sigma= square root of variance
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finding Q1 and Q3
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Q1= number of data points x (25/100)
Q3=number of data points x (75/100) |
