---
url: "https://questionstar.com/principles-of-survey-research/chapter-5/slide-172.html"
title: "Measures of Dispersion"
type: "lehrbuch-slide"
chapter: 5
chapterTitle: "Data Analysis: A Concise Overview of Statistical Techniques"
slide: 172
---

# Measures of Dispersion

Variance is the average of squared deviations from the mean

Population Variance

(variance of the population)

![σ² = ∑(xᵢ − μ)² / n](/principles-of-survey-research/media/formel_varianz_pop.png)

Sample Variance

![s² = ∑(xᵢ − x̄)² / (n − 1)](/principles-of-survey-research/media/formel_varianz_sample.png)

*[Diagramm: Measures of Dispersion]*

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*Slide 172 of 274 · Chapter 5: Data Analysis: A Concise Overview of Statistical Techniques · Principles of Survey Research · Dr. Paul Marx*