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| statistics | The study of collecting, analyzing and presenting data. |
| data | Information, often numerical, which is gathered for statistical purposes. |
| frequency table | A table for organizing a set of data that shows the number fo times each item or number appears. |
| scale | The set of all possible values of a given measurement, including the least and greatest numbers in the set, separated by the intervals used. |
| interval | The difference between successive values on a scale. |
| tally mark | A counter used to record items in a group. |
| graph | A visual way to display data. |
| bar graph | A graph using bars to compare quantities. |
| vertical axis | The axis on which the scale and interval are shown in a bar or line graph. |
| horizontal axis | The axis on which the categories are shown in a bar or line graph. |
| line graph | A graph used to show how a set of data changes over a period of time. |
| circle graph | A graph used to compare parts of a whole. |
| stem-and-leaf plot | A system used to condense a set of data where the greatest place value of the data forms the stem and the next greatest place value forms the leaves. |
| average | The sum of two or more quantities divided by the number of quantities. |
| measures of central tendency | A number that helps describe all of the data in a data set (aka "mean").. |
| mean | A measure of central tendency that shows the sum of the numbers in a data set divided by the number of pieces of data (aka "average"). |
| median | The middle number in a set of data when the data are arranged in numerical order from least to greatest. |
| mode | The number(s) or item(s) that appear most often in a set of data. |
| range | The difference between the greatest number and the least number in a set of data. |
| outlier | A value that is much higher or much lower than the other values in a set of data. |
