Statistics Center and Variability

A distribution where one side of the distribution has more values farther from the bulk of the data than the other side, so that the mean is not equal to the median.

A distribution with a vertical line of symmetry in the center of the graphical representation, so that the mean is equal to the median.

A quantity that is calculated from sample data, such as the mean, median, or MAD (mean absolute deviation).

• statistic

• measure of variation

• standard deviation

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A measure of the variability, or spread, of a distribution calculated by a method similar to the method for calculating the MAD (mean absolute deviation).

• standard deviation

• MAD

• mean

• mode

A data value that is unusual in that it differs quite a bit from the other values in the data set. .

• outlier

• statistic

• mean

• symmetric

A value that attempts to describe a set of data by identifying a central position of the data set (as representative of a "typical" value in the set). Ex: mean, median, mode.

• measure of center

• measure of variability

• statistic

• spread

A summary statistic that represents the amount of dispersion in a data set. It defines how far away the data points tend to fall from the center. Examples: IQR (interquartile range), MAD (mean absolute deviation), and standard deviation.

• measure of variability

• measure of center

• statistics

• IQR

The average of a set of numbers. Calculated by adding up all of the terms and dividing by the number of terms.

The middle value in a list of numbers. Found by listing your data in numerical order, then locating the number in the middle.

The most common value in a set of data. Can be more than one number.