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Mathematics 8 Online
OpenStudy (anonymous):

The standard deviation of population A is 17.6, and that of population B is 21.2. If sample sizes of 25 and 30 are taken from population A and population B, respectively, what is the standard deviation of the sample mean differences? 4.89 5.03 5.23 5.54

OpenStudy (anonymous):

5.23 is the answer @eddie3506

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