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2.9.1: Measures of Variance and Standard Deviation - Loss of Information - Optional Material
https://stats.libretexts.org/Courses/Fort_Hays_State_University/Elements_of_Statistics/02%3A_Descriptive_Statistics/2.09%3A_Measures_of_Variance_and_Standard_Deviation_on_Grouped_Data/2.9.01%3A_Measures_of_Variance_and_Standard_Deviation_-_Loss_of_Information_-_Optional_Material
What if we have data grouped over intervals instead of discrete single-value groups as previously? This section will help us roughly estimate the range, variance, and standard deviation measures of th...What if we have data grouped over intervals instead of discrete single-value groups as previously? This section will help us roughly estimate the range, variance, and standard deviation measures of the distribution since we have lost some information about the specific data values.

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