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### 15 Cards in this Set

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 survey a set of questions that is used to gather information about a group or to find the preference of a group sample a part of the group that is chosen to represent the whole group or population population the entire group being surveyed frequency the number of times a piece of data occurs mean an average of a group of numbers median the middle number when data are arranged in order mode the number of item that occurs most often in a set of data range the difference between the highest and lowest numbers in a ordered series of numbers stem-and-leaf plot a graph that organizes data by place value pictograph a graph that uses symbols or pictures and a key to display countable data bar graph a graph that displays countable data with vertical or horizontal bars; compares fact about groups of data line graph a graph that shows how data changes over time circle graph a graph that shows how parts of the data are related to the whole and to each other line plot a visual picture of data so you can quickly see the most common numbers outlier a data value that is well-separated from other data values in a set