| The set of all possible outcomes of a probability experiment | |
| Anything in the survey design that influences the responses from the sample | |
| Statistics law stating that a large number of items taken at random from a population will on the average have the population statistics | |
| An error that occurs when a researcher concludes that the independent variable had no effect on the dependent variable, when in truth it did; a "false negative" Source: CHH, 2 Ed. |