STDEV Google Sheet Formula
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STDEV Formula Syntax
Example Use Case
Estimating sample standard deviation for statistical analysis
Understanding the STDEV Formula
The STDEV function in Excel calculates the standard deviation of a sample, measuring how spread out numbers are from their mean. It’s a key statistical tool for assessing variability—like test score consistency or sales fluctuations—assuming the data is a sample, not the full population.
STDEV(A1:A5) with 10, 20, 30, 40, 50 returns ~15.81, using the sample formula √(Σ(x - mean)² / (n-1)). It ignores text and blanks, focusing on numbers, making it ideal for sample-based analysis.
Why Use STDEV?
STDEV quantifies dispersion—think quality control or risk assessment. Its sample focus (n-1 denominator) adjusts for bias in small datasets, offering a reliable measure of spread for statistical inference.
Example with Sample Data
| Numbers | Formula | Result |
|---|---|---|
| 10, 20, 30 | =STDEV(10, 20, 30) | 10 |
| 5, 15, 25 | =STDEV(5, 15, 25) | 10 |
| 1, 2, 3, 4 | =STDEV(1, 2, 3, 4) | 1.29 |
STDEV measures spread: 10 for 10, 20, 30; ~1.29 for 1, 2, 3, 4. It’s a sample spreader.
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