Notes 05- Shape & Center

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9 Terms

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Distribution

Describes how values are spread across a quantitative variable.

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Histogram

Groups numerical values into intervals called bins; bar height represents frequency.

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Outlier

A value that is unusually far from the rest of the data.

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Symmetric

The two sides are approximately mirror images.

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Skewed right

Most values are on the left, with a long tail to the right.

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Skewed left

Most values are on the right, with a long tail to the left.

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Bell-shaped

Roughly symmetric with one central mound.

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Mean:

Add all values and divide by the number of values.

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Median:

Put all values in order and find the middle. With an even number of values, average the two middle values.