# Pre-Algebra Chapter 9 Vocabulary

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### Measures of Central Tendency

The statistics mean, median, & mode

### Mode

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

### Median

The middle value when the data are in numerical order

### Mean

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

### Average

Another term for "mean" of data

### Outlier

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

### Frequency

The number of times a data item occurs

### Frequency Table

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

### Line Plot

A number line that shows x's for the frequency

### Histogram

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

### Stem-and-Leaf Plot

Shows data items in order

### Range

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

### Box-N-Whiskers Plot

Shows the distribution of data on a number line

### Quartiles

Values that divide the data into two equal parts

### Scatter Plot

Related data from two different sets is graphed as points

### Trend Line

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

### Positive Trend

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

### Negative Trend

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

### No trend

The two values do not have a relationship

### Bar Graph

A graph used when comparing amounts

### Legend

Another name for a "key", used for graphing

### Line Graph

A graph used to show changes over time

Example: