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Statistics: Chapter1

Where Do Data Come From?

QuestionAnswer
Individuals Objects described by a set of data (ex. People, animals, things)
Variable Characteristic of an individual (different values for different individuals, not always numerical)
Observational Study Observe individuals and measure variables of interest (does not attempt to influence responses)
Response A variable that measures an outcome or result of a study
Purpose of an Observational Study: Describe some group or situation
Sample Surveys Survey of a group of individuals by studying only some of its members that represent the larger group. (a kind of observational study)
Population Entire group of individuals about which we want information
Sample Part of the population from which we actually collect information (used to draw conclusions about the whole)
Census Sample Survey that attempts to include the entire population in the sample
Experiment Imposes treatment on individuals in order to observe cause and effect.
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