If we wanted to compare muscular endurance between a very large person and a very small person what method would we be the best method to use

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Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?

If you’d like to improve communication one of the things your fresh i want speaking to someone is