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AP Stats Vocab part1
Term | Definition |
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Population | a statistical study is the entire group of individuals we want information |
Census | collects data from every individual in the Population about. |
Sample | a subset of individuals in the population from which we actually collect data |
Sample survey | a study that collects data from a sample that is chosen to represent a specific population. |
Convenience sample | Choosing individuals from the population who are easy to reach results |
Bias | statistical study that is likely to underestimate or likely to overstimulate the value you want to know |
Voluntary response sampling | allows people to choose to be in the sample by responding to a general invitation. |
Random sampling | involves using a chance process to determine which members of a population are included in the sample. |
Simple random sample | of size n is chosen in such a way that every group of n individuals in the population has an equal chance to be selected as the sample. |
Strata | are groups of individuals in a population who share characteristics thought to be associated with the variables being measured in a study. |
Stratified random sampling | selects a sample by choosing an SRS from each stratum and combining the SRSs into one overall sample. |
Cluster | a group of individuals in the population that are located near each other. |
Cluster sampling | selects a sample by randomly choosing clusters and including each member of the selected clusters in the sample. |
Systematic random sampling | selects a sample from an ordered arrangement of the population by randomly selecting one of the first k individuals and choosing every kth individual thereafter. |
Undercoverage | occurs when some members of the population are less likely to be chosen or cannot be chosen in a sample. |
Nonresponse | occurs when an individual chosen for the sample can’t be contacted or refuses to participate. |
Response bias | occurs when there is a systematic pattern of inaccurate answers to a survey question. |
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