Statistics

Standard Deviation Calculator - σ & s

Calculate standard deviation and variance for sample or population data. Measure data spread and variability with detailed statistics.

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Calculate Standard Deviation

Sample: Use when data is a subset. Population: Use when you have all data.

📊 About Standard Deviation

Definition: Measures the spread or dispersion of data points from the mean

Sample (s): Use when data is a sample from a larger population (divides by n-1)

Population (σ): Use when you have data for the entire population (divides by n)

Low σ: Data points are close to the mean (less variation)

High σ: Data points are spread out (more variation)

Uses: Quality control, risk assessment, data analysis

How to Use Standard Deviation Calculator

  1. 1

    Choose between sample (s) or population (σ) standard deviation.

  2. 2

    Enter your numbers separated by commas, spaces, or new lines.

  3. 3

    Click "Calculate" to compute standard deviation and variance.

  4. 4

    View detailed results including mean, sum, and variance.

Frequently Asked Questions

What is standard deviation?

Standard deviation measures how spread out numbers are from their mean. A low standard deviation means data points are close to the mean, while a high standard deviation means they are spread out.

Sample vs population standard deviation?

Use sample (s) when your data is a subset of a larger population (divides by n-1). Use population (σ) when you have data for the entire population (divides by n).

What is variance?

Variance is the square of standard deviation. It represents the average squared deviation from the mean.

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Standard Deviation Calculator - σ & s | Yoopla