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Measures of Central Tendency

The statistics mean, median, & mode

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Mode

The data item with the greatest frequency. (occurs most often)

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Median

The middle value when the data are in numerical order

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Mean

The sum of the data divided by the total number of data items.

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Average

Another term for "mean" of data

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Outlier

A data item that is much higher or lower than the rest of the data

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Frequency

The number of times a data item occurs

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Frequency Table

A chart/table that lists each data item with its frequency

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Line Plot

A number line that shows x's for the frequency

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Histogram

A special type of bar graph used to show frequency of data

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Stem-and-Leaf Plot

Shows data items in order

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Range

The difference between the greatest and least values in a set of data

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Box-N-Whiskers Plot

Shows the distribution of data on a number line

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Quartiles

Values that divide the data into two equal parts

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Scatter Plot

Related data from two different sets is graphed as points

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Trend Line

A line that closely fits the data points in a scatter plot

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Positive Trend

As one set of values increases, the other set tends to increase

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Negative Trend

As one set of values increases, the other set tends to decrease

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No trend

The two values do not have a relationship

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Bar Graph

A graph used when comparing amounts

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Legend

Another name for a "key", used for graphing

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Line Graph

A graph used to show changes over time

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