| A | B |
|---|
| Individuals | the objects described by a set of data. Individuals may be people, animals, or things |
| Variable | any characteristic of an individual. a variable can take diferent values for different individuals. |
| Observational study | observes individuals and measures variables of interest but does not attempt to influence the responses. |
| Sample survey | gain information about the whole by examining only a part. |
| population | the entire group of individuals about which we want information |
| sample | part of the population from which we collect information, which is then used to draw conclusions about the whole |
| experiment | deliberately imposes some treatment on individuals in order to observe their responses. |
| instrument | used to take a measurement |
| units | what we use to record a measurement |
