| A | B |
|---|
| a numerical fact that describes the population | perameter |
| a numerical fact that describes a sample | statistic |
| a sample chosen by a probability method so that every sample of the desired size has an equal chance to be chosen | simple random sample , such as a phone-in survey to a 900 number, in which the respondents choose themselves sample |
| sample such as phone in survey to 900 number in which respondents choose thenselves | voluntary response |
| a sample consisting of whichever individuals are handy or easiest to reach | convenience |
| when we make an estimate of a population percentage based on sample data, the amount by which our estimate likely to be "off" | margin of error |
| an error which occurs when some groups in the population are left out because they are not included in the list | under coverage |
| sampling method in which population is divided into distinct groups and a separate random sample isi chosen from the group | blocked design |
| scientific study in which the researcher imposes a treatment | control experiment |
| study in which researcher does NOT impose a treatment but merely compares 2 or more groups | observation |
| a dummy treatment witih no active ingredients | placebo |
| when people respond to the IDEA of a treatment rather than the treatment itself | placebo effect |
| experimental design in which subjects are separated first by some factor that might affect results before being assigned to treatment/control | block design |
| the participents in an experiment | subjects |
| an observed effect so large that it would rarely occur by chance | statistically significant |
| study in which neither the subjects not those who administer treatments are aware who has real treatment and who has placebo | double-blind |
