Chapter 11. Hypothesis Test about Population Variance ( Standard Deviation ). Variance. Variance Squared standard deviation Sample variance: s 2 Population variance: σ 2 Measuring the spread (the variability , the dispersion ) of the data around the mean

**Hypothesis**Testing of**Variance****Hypothesis**Testing**Standard Deviation**Unknown**Standard Deviation**vs**Variance**- Relationship Between
**Standard Deviation**and**Variance** **Population Standard Deviation**Definition- Mean Median
**Variance Standard Deviation** **Population Standard Deviation**vs Sample**Test**Statistic for**Population Variance**

Chapter 11

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