# Keyword Analysis & Research: standard deviation calculator easy calculator

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What is the formula for calculating standard deviation?

Standard Deviation Formula. Standard deviation (σ) is the measure of spread of numbers from the mean value in a given set of data. Sample SD formula is S = √∑ (X - M)2 / n - 1. Population SD formula is S = √∑ (X - M)2 / n. Mean(M) can be calculated by adding the X values divide by the Number of values (N).

What is a simple explanation of standard deviation?

Standard deviation is a number used to tell how measurements for a group are spread out from the average (mean), or expected value. A low standard deviation means that most of the numbers are very close to the average. A high standard deviation means that the numbers are spread out.

What is the purpose of standard deviation?

The standard deviation is a value used frequently in the social sciences and statistics, especially when discussing data printed in research papers or journals. The standard deviation can be useful in determining how to continue research or a course of action depending on how much variance exist in the data.