medium · GMAT Quant
A digital analytics team measures transaction completion time across Desktop (n_D = 40, barx_D = 4 minutes) and Mobile (n_M = 60, barx_M = 7 minutes) users, yielding an overall average completion time of barx = 5.8 minutes. If the sum of squared deviations within device groups is mathrmSSW = 584
What is the total sum of squared deviations mathrmSST?
- 216
- 584
- 730
- 800
- 1,016
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