| 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. | |
| Range of the middle 50 of the values; Q3-Q1 75th percentile - 25th percentile | |
| Probability based on comparing the number of possible favorable outcomes to the number of total possible outcomes | |
| Stating that the null hypothesis is false when it is in fact true. |