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Calculating Deviations and the Sum of Squared Deviations

Measures of Dispersion and Variation

8th Grade·Math·Open Global Math

Updated 1 month ago · 6 views

Compute individual deviations from the mean and sum their squares as a foundation for variance.

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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

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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 DeviationsYou are here
Computing Population and Sample Variance and Standard DeviationNot started yet
Comparing Measures of Spread: IQR vs MAD vs Standard DeviationNot started yet

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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.