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Box-and-Whisker Plots

Plotting the five-number summary for ascending data.

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Box-and-Whisker Plots

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Vocabulary

five point summary

The numbers needed to construct a box-and-whisker plot are called the five-point-summary. The five points are the minimum, the lower median (Q1), the median, the upper median (Q3), and the maximum.

line of fit

A line of fit is a straight or continuously curved line representing the trend of changes in the comparison of two data sets (or one set of bivariate data).

observed data

Observed data are the values that result from computations performed on the input variable.

Outlier

In statistics, an outlier is a data value that is far from other data values.

skewed

As with the horizontal skewing of a histogram, stem plots with a obvious skew toward one end or the other tend to indicate an increased number of outliers either lesser than or greater than the mode.

statistical correlation

Statistical correlation is a representation of possible related changes in values between the two sets of data.

trends

Trends in data sets or samples are indicators found by reviewing the data from a general or overall standpoint

uniform

A uniform shaped histogram indicates data that is very consistent; the frequency of each class is very similar to that of the others.

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