| Term | Definition |
|---|
| population | the entire group about which data are being collected |
| data | information providing the basis of a discussion from which conclusions may be drawn; often take the form of numbers that can be displayed graphically or in a table |
| sample | part of a population selected so as to gain information about the whole population |
| frequency | the number of times an event occurs or the number of items in a given category |
| frequency table | a table listing a variable together with the frequency of each value |
| stem-and-leaf plot | a way of organizing and presenting a collection of numbers by grouping data under major groups and minor individuals |
| class interval | a category or division used for grouping a set of observations |
| bar graph | a visual display of data in which quantities are represented by bars of equal width; typically used with discrete data |
| frequency distribution | a set of values of a variable, together with the number of occurrences of each value |
| histogram | a visual display of data that have been organized into equal class intervals, which appear on the horizontal axis; the heights of the rectangles are proportional to the frequencies they represent; typically used with continuous data |
| pictogram | a graph that uses pictures or symbols to represent variable quantities |
| circle graph (pie chart) | a circle divided into sectors whose areas are proportional to the variables represented |
| central angle | a measure of proportion in a pie chart |
| percent of data for a category x 360 degrees | formula for calculating the central angle |
| median | the middle term in a frequency distribution |
| box-and-whisker plot | a horizontal representation of the spread of a distribution |
| broken-line graph | a graph created by joining data points with line segments |
Combine with other sets
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