Computing Population and Sample Variance and Standard Deviation

Updated 1 month ago · 3 views

Compute population variance (σ²) and sample variance (s²), recognizing the difference between dividing by N versus n - 1.

Premium Lesson

Upgrade to unlock this lesson, practice questions, and your personal tutor.

This lesson is part of a track

Public learning track

Measures of Dispersion and Variation

8th Grade · Math · Open Global Math

6 lessons

Goal

Quantify data spread using quartiles, IQR, mean absolute deviation, sum of squared deviations, and sample/population variance.

6 lessons

0 of 6 done

Calculating Range and Interquartile Range with Outlier RulesUp next
Calculating Mean Absolute Deviation for Data SetsNot started yet
Interpreting MAD as a Measure of Data SpreadNot started yet
Calculating Deviations and the Sum of Squared DeviationsNot started yet
Computing Population and Sample Variance and Standard DeviationYou are here
Comparing Measures of Spread: IQR vs MAD vs Standard DeviationNot started yet

View full track

Learning standards covered

OGM.9.SP.2Open Global Math Standards 2026™ · 8th Grade

Compute and interpret measures of center (mean, weighted mean, median, mode) and dispersion (range, quartiles, interquartile range, mean absolute deviation [MAD], sum of squared deviations, variance); display and analyze distributions using histograms and box plots.