MathsGee Answers is Zero-Rated (You do not need data to access) on: Telkom |Dimension Data | Rain | MWEB
First time here? Checkout the FAQs!
Institutions: Global | Ekurhuleni Libraries | Joburg Libraries | Tshwane Libraries | Invest in Zim

MathsGee is Zero-Rated (You do not need data to access) on: Telkom |Dimension Data | Rain | MWEB

0 like 0 dislike
Why is the sample variance divided by $n-1$ instead of $n$?

s^2 = \frac{\sum(x - \bar{x})^2}{n-1}.
in Data Science by Diamond (61,686 points) | 158 views

1 Answer

3 like 0 dislike
Best answer
This is necessary to correct for the bias in the sample variability.

If not corrected, the sample variability will be biased and consistently underestimates the population variability and variance.

Dividing by a smaller value (n - 1) increases the value of the sample variance, thereby making it an accurate and unbiased estimate of the population variance.
by Diamond (39,212 points)
selected by

Welcome to MathsGee Answers, a free online study network where students can ask, answer, and explore 24/7 for improved outcomes.

MathsGee Supporting City of Joburg

Enter your email address:

MathsGee Tools

Math Worksheet Generator

Math Algebra Solver

Trigonometry Simulations

Vectors Simulations

Matrix Arithmetic Simulations

Matrix Transformations Simulations

Quadratic Equations Simulations

Probability & Statistics Simulations

PHET Simulations

Visual Statistics

Interactive Courseware

ZeroEd Search Engine

Article Rewriter Tool

Word Counter Tool

Other Tools

STEM Gender Equality | ZOOM | Slack | eBook