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A pie chart is never, ever, appropriate for statistical tests. It can be a useful way of illustrating results but it has no usefulness in testing.
A minimum covariance determinant (MCD) is a statistical technique that is useful for identifying outliers and getting a measure of their impact.
There are multiple quantitative methods for calculating and graphically illustrating statistical spreads. Among the most useful are calculating and graphic standard deviations.
It is a symmetric bell-shaped distribution which can be used to represent a very large number things from every-day life. It has some very useful statistical properties.
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