# Standard Deviation of a Data Set

## Percentages and the square root of the variance

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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## Standard Deviation of a Data Set

by Melissa Moreno //basic
Covers standard deviation.
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## Standard Deviation of a Data Set

by Robert Barnett //basic
Covers standard deviation.
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## Variance, Standard Deviation, and Coefficient of Variation

by Danielle Pintz //basic
covers variance, standard deviation, and coefficient of variation
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## Measurement of Data

by Danielle Pintz //advanced
covers an intro to data and measurement, levels of measurement, and descriptive statistics
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