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# Tests of Single Variance

## A test of a single variance may be right-tailed, left-tailed, or two-tailed. One example is the chi-squared test.

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.

## Tests of Single Variance

This Concept introduces students to testing variance using the chi-square distribution as well as creating a confidence interval for the variance.
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## Chi-Square Test of Population Variance Example

Shows how to run a test to determine the variability of a certain factor.
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## Chi-Square Test of Population Variance

Goes through the steps of using a chi-square test of population variance on an example about hedge fund volatility.
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