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# Statistics

TermDefinition
statistic a piece of numerical data
statistical question a question that can be answered by collecting quantitative data that will vary
variability the measure of the spread of a data set
natural variability differences that occur in a data set because of a natural system
measurement variability differences that occur in a data set because of user error
sample variability differences that occur in a data set because of a different sample or set
stem-and-leaf plot a method to display the frequency of a value in a set of data
histogram a method to display groups of data in a set of data
mean absolute variation a method to display how far from the mean each data point (on average) is
5-number summary a method to display data points in a set used to create a boxplot
symmetrical data that, when graphed, are evenly distributed around the mean
bimodal data that, when graphed, have two clusters on each end of the graph
skewed data that, when graphed, have one cluster at either end of the graph
spread a method to display how far apart data points are in a set (measured by range)
dispersion a method to display how far apart data points are is a set (also known as spread)
cluster a group of data that is close together in a set of data
outlier a data point in a set of data that is at least 1.5 times smaller than Q1 -OR- at least 1.5 times larger than Q3
boxplot a method to organize, summarize, and display data in a set of data
first quartile a statistic in a boxplot describing the lowest portion of data (also known as Q1 or lower quartile)
third quartile a statistic in a boxplot describing a portion of data (also known as Q3 or upper quartile)
interquartile range a statistic in a boxplot describing the range between Q3 and Q1 (also known as IQR)
whiskers data points in a boxplot that do not fall within the IQR (these are the minimum and maximum data points)
range the difference between the largest and smallest data points in a set of data (this is the measure used to describe spread or dispersion)
average the calculated central value of a set of data (also known as mean)
mean the calculated central value of a set of data (also known as average)
median the middle number in a data set that has been written in numerical order
centering point the middle number in a data set that has been written in numerical order (also known as median)
Created by: lowers
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