AP Statistics Vocabulary for Gathering Data. The password is one of the many services that Mr. Rod offers.
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| 42905439 | biased | any systematic failure of a sampling method to represent its population | 42905439 | |
| 42905440 | strata | when groups of experimental units are similar, they are gathered into these groups | 42905440 | |
| 42905441 | census | a sample that consists of the entire population | 42905441 | |
| 42905442 | cluster | sampling design in which entire groups are chosen at random | 42905442 | |
| 42905443 | completely randomized | type of experiment in which all experimental units have an equal chance of receiving any treatment | 42905443 | |
| 42905444 | confounding | when the levels of one factor are associated with the levels of another factor so their effects cannot be separated | 42905444 | |
| 42905445 | control | aspects of the experiment that we know may have an effect on the response, but that are not the factors being studied | 42905445 | |
| 42905446 | control group | experimental units assigned to a baseline treatment level | 42905446 | |
| 42905447 | convenience | sampling design where individuals are chosen based on who is easily available | 42905447 | |
| 42905448 | double blind | neither the subjects nor the people who have contact with them know which treatment a subject has received | 42905448 | |
| 42905449 | experimental units | individuals on which an experiment is done | 42905449 | |
| 42905450 | experiments | study in which subjects are randomly assigned to treatments | 42905450 | |
| 42905451 | factor | variable whose levels are controlled by the experimenter | 42905451 | |
| 42905452 | heterogeneous | not similar in makeup | 42905452 | |
| 42905453 | homogeneous | similar in makeup | 42905453 | |
| 42905454 | level | specific values that the experimenter chooses a factor | 42905454 | |
| 42905455 | matched pairs | type of study in which subjects who are similar in ways not under study may be grouped together and then compared with each other on the variables of interest | 42905455 | |
| 42905456 | multistage | sampling schemes that combine several sampling methods | 42905456 | |
| 42905457 | nonresponse | type of bias that is problematic because the intended sample is incomplete | 42905457 | |
| 42905458 | observational study | study based on data in which no treatments have been assigned to subjects | 42905458 | |
| 42905459 | outcome | an individual result of a component of a simulation | 42905459 | |
| 42905460 | placebo | treatment known to have no effect, administered so that all groups experience the same conditions | 42905460 | |
| 42905461 | placebo effect | the tendency of many human subjects to show a response even when administered a fake treatment | 42905461 | |
| 42905462 | population | the entire group of individuals or instances about whom we hope to learn | 42905462 | |
| 42905463 | prospective | observational study in which subjects are followed to observe future outcomes | 42905463 | |
| 42905464 | random behavior | an occurrence for which we know what outcomes could happen, but not which particular values will happen | 42905464 | |
| 42905465 | randomization | process by which each individual is given a fair chance of selection | 42905465 | |
| 42905466 | response | type of bias that is problematic because false information may be given | 42905466 | |
| 42905467 | retrospective | observational study in which subjects are selected and then their previous conditions or behaviors are determined | 42905467 | |
| 42905468 | sample | a (representative) subset of a population, examined in hope of learning about a population | 42905468 | |
| 42905469 | simple random | sampling design in which each set of n elements in the population has an equal chance of selection | 42905469 | |
| 42905470 | sampling frame | a list of individuals from whom the sample is drawn | 42905470 | |
| 42905471 | sampling variability | the natural tendency of randomly drawn samples to differ, one from another | 42905471 | |
| 42905472 | sample survey | a study that asks questions of a sample drawn from some population in the hope of learning something about the entire population | 42905472 | |
| 42905473 | simulation | models random events by using random numbers to specify outcomes with relative frequencies that correspond to the true real-world relative frequencies we are trying to model | 42905473 | |
| 42905474 | single blind | when either the subjects or the people who have contact with them do not know which treatment a subject has received | 42905474 | |
| 42905475 | statistically significant | when an observed difference is too large to believe that it is likely to have occurred naturally | 42905475 | |
| 42905476 | block | a subdivision of the population | 42905476 | |
| 42905477 | stratified | sampling design in which the population is divided into several strata, and random samples are then drawn from each stratum | 42905477 | |
| 42905478 | subjects | people who are studied | 42905478 | |
| 42905479 | systematic | sample drawn by select an individual from a list and then each of the next N individuals from the sampling frame | 42905479 | |
| 42905480 | treatment | the process or intervention applied to randomly assigned experimental units | 42905480 | |
| 42905481 | trial | the sequence of several components representing events that we are pretending will take place | 42905481 | |
| 42905482 | undercoverage | type of bias that is problematic because some groups are not represented in the sample | 42905482 | |
| 42905483 | voluntary response | type of bias that is problematic because those who volunteer tend to have strong negative opinions | 42905483 | |
| 42905484 | voluntary response | sampling design where individuals can choose on their own whether to participate in the sample | 42905484 | |
| 42905485 | wording bias | a type of response bias where the question is posed to achieve a desired result | 42905485 |
