# Shared Flashcard Set

## Details

AP Stat Chapters 11+12
Simulations and Samples/Surveys
22
Other
09/15/2008

Term
 Randomness
Definition
 We know when outcomes can happen, but cannot predict individual outcomes. Over the long haul, outcomes can have set percentages.
Term
 Waiting Time
Definition
 Infinite Number of tries
Term
 Fixed Trial Size
Definition
 Set number of tries
Term
 What do you put in a Scheme?
Definition
 single or double digits? Assign the digits. Ignore which numbers?
Term
 Stopping Rule
Definition
 When Do you stop each trial
Term
 Count
Definition
 what is the outcome of the simulation
Term
 Non-Replacement
Definition
 State if numbers can be repeated in each trial
Term
 Simulation Conclusion
Definition
 "Based on our simulation we estimate"
Term
 What to include in a simulation
Definition
 scheme, stopping rule, count, non-replacement
Term
 Describe a Voluntary Response
Definition
 People decide for themselves whether to participate or not. Not a good sampling option. (example= radio opinion)
Term
 Convenience Sampling
Definition
 Take sample of individuals easiest to reach. not a good sampling option.
Term
 Simple Random Sample
Definition
 Every member in the population has an equal chance of being selected. Every possible sample of that size is equally likely
Term
 Stratified Random Sample
Definition
 Subgroups of population appear in roughly the same percentage as in the sample. Perform an SRS with each subgroup
Term
 Systematic Sample
Definition
 First member of population is chosen by some random procedure, the rest according to some random pattern
Term
 Cluster Sampling
Definition
 Split Population into similar parts. Randomly select one or more of the clusters for the samples
Term
 Multistage
Definition
 Sampling schemes that combine two or more methods
Term
 Systematic Bias
Definition
 The tendency for results to favor systematically one outcome over the other
Term
 Types of Systematic Bias
Definition
 Undercoverage, Voluntary Response Bias, Wording Bias, Response Bias
Term
 Undercoverage
Definition
 Some Part of the Population is excluded
Term
 Voluntary Response Bias
Definition
 People who feel more strongly are more likely to respond
Term
 Wording Bias
Definition
 Wording of question influences the response in some systematic way
Term
 Response Bias
Definition
 Response is biased in some systematic way (may not want to offend the interviewer)
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