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32 terms

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