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The Range Quiz

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Why Measure Variability?

Variance and Standard Deviation

Back to: The Range

Chapter 4: Variability

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Variability Explained Without Math
Why Measure Variability?
The Range
Variance and Standard Deviation
Deviations From The Mean
The Variance (to the rescue!)
The Standard Deviation
Recap
Example | Deviations From The Mean
Example | Variance
Example | Standard Deviation (plus checking your answers)
All the Essential Formulas
Sum of Squares | Computational vs Definitional Formulas
Sample Variance and Sample Standard Deviation
Understanding the Standard Deviation
Using the Standard Deviation to Visualize a Distribution
What is a Biased Estimator?
How Changing the Data Affects a Standard Deviation

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