| A | B |
|---|
| mean | The sum of the values in a data set divided by the number of values. |
| median | The middle value of a set of data when the values are written in order from least to greatest. |
| mode | The value in a data set that occurs most often. |
| range | The difference between the greatest and least values in a data set. |
| population | An entire group of people or objects you want information about. |
| sample | A part of the population. |
| random sample | A sample that is selected so that every member of the population has an equal chance of being chosen. |
| biased sample | A sample that is not a good representation of the population. |
| bar graph | A graph used to make comparisons. The horizontal axis is labeled in words. |
| horizontal axis | The axis of a graph that runs from left to right. |
| vertical axis | The axis of a graph that runs up and down. |
| line graph | A graph that is used to show a change in data over time. The horizontal axis is labeled in years. |
| stem-and-leaf plot | A graph that shows the range of data and where that data clusters. |
| stem | Represents the tens digit of a number. |
| leaf | Represents the ones digit of a number. |
| upper quartile | The median of the upper half of a set of data. |
| lower quartile | The median of the lower half of a set of data. |
| upper extreme | The greatest number in a set of data. |
| lower extreme | The least number in a set of data. |
| box-and-whisker plot | A data display that divides a data set into 4 parts using the lower extreme, lower quartile, median, upper quartile and upper extreme. |
| frequency table | A table used to group data values into intervals. |
| frequency | The number of data values that lie in an interval of a frequency table or histogram. |
| histogram | A graph that displays data from a frequency table. |
| factor | A number used in a multiplication equation to find a product. |
