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Introduction to Statistical Analysis

3. Measures of Spread and Data

3.1 Variance and Standard Deviation

These videos explain the difference between the variance of a population of a sample, how to estimate the variance of a population based on a sample, and how to find the standard deviation and why it is important.
  • Video 1: Variance of a Population
  • Video 2: Sample Variance
  • Video 3: Standard Deviation

Source: Khan Academy
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