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# CH 9 Math Statistics

### math definitions

The median of the lower half of a data set; represented by ܳQ1 first quartile
A measure of variation for a data set, which is the difference of the third quartile and the first quartile interquartile range (IQR)
The sum of the data divided by the number of data values mean
An average of how much data values differ from the mean mean absolute deviation (MAD)
A measure that describes the typical value of a data set The mean, median, and mode are all measures of center. measure of center
A measure that describes the spread, or distribution of a data set The range, interquartile range, and mean absolute deviation are all measures of variation measure of variation
For a data set with an odd number of ordered values, the median is the middle value; For a data set with an even number of ordered values, the median is the mean of the two middle values. median
The data value or values that occur most often; Data can have one mode, more than one mode, or no mode. mode
A data value that is much greater than or much less than the other values in a data set outlier
Values that divide a data set into four equal parts quartiles
The difference of the greatest value and the least value of a data set range (of a data set)
A question for which a variety of answers is expected; The interest is in the distribution and tendency of those answers. statistical question
The science of collecting, organizing, analyzing, and interpreting data statistics
The median of the upper half of a data set; represented by ܳQ3 third quartile
Created by: Kerzetski
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