| Range of the middle 50 of the values; Q3-Q1 75th percentile - 25th percentile | |
| A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean. | |
| A table containing counts for two categorical variables. It has r rows and c columns. | |
| The hypothesis that states there is a difference between two or more sets of data. |