Data Vocabulary

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Statistics
The practice of collecting and analyzing data in large quantities
Data
Values such as counts, ratings, measurements, or opinions that are gathered to answer questions
Mean
A value that represents the "evening out" of the values in a set of data
Median
The number that is the midpoint of a set of data
Mode
The data value that occurs the most
Range
The difference between the least value and the greatest value in a data set
Line Plot
A quick, simple way to organize data along a number line where the X's (or other symbol) above a number represent how often each value is mentioned
Measures of Center
Establish a central location in the data set
Measures of Variability
Establish the degree of variability (or scatter) of the individual data values and their deviations for the measures of center
Histogram
A display that shows the distribution of numeric data. The range of the data values, divided into intervals, is displayed on the horizontal axis. The vertical axis shows the frequency
Frequency Table
A list of items or intervals that shows the number of times, or frequency, with which they occur
Interval
A set of real numbers with the property that any number that lies between two numbers in the set is also included in the set
Distribution
The arrangement of values in a set
Gap
A break or opening
Cluster
Data that is close together
Peak
Being a the point of maximum frequency, intensity, use, etc
Box Plot
A method of visually displaying a distribution of data values by using the median, quartiles, and extremes of the data set. A box shows the middle 50% of the data
Quartiles
One of the values that divides the distribution of the variable into four groups having equal frequencies
Lower Quartile
For a data set with median m, the first quartile is the median of the data values less than m
Upper Quartile
For a data set with median m, the third quartile is the median of the data values greater than m
Outlier
A value that lies far from the "center" of a distribution
Inter-Quartile Range
A measure of variation is a set of numerical data, the inter-quartile range is the distance between the first and third quartiles of the data set
Five-Number Summary
The minimum value, lower quartile, median, upperquartile, and maximum value of a data set
Minimum Value
The lowest value in a data set
Maximum Value
The greatest value in a data set
Mean Absolute Deviation
The average distance of all data values from the mean of the data set
Variability
Degree to which data are spread out around a center value
Continuous Data
Data that can take any value
Discrete Data
Data that would not be represented with fractional parts, such as people, tents, etc
Skewed
Asymmetry in a frequency distribution
Summary Statistics
Includes quantitative measures of center (mean and median) and variability (interquartile range and mean absolute deviation) including extreme values (minimum and maximum), mean, median, mode, range, and quartiles
Symmetrical
Characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement or corresponding parts