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Maximum oxygen uptake volume (VO 2max , measured in mL per kg per minute) is a key indicator of aerobic fitness.

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Maximum oxygen uptake volume (VO2max, measured in mL per kg per minute) is a key indicator of aerobic fitness. A 2013 study suggested that a VO2max of 60 mL/kg/min is the minimum threshold necessary to play men's professional soccer at an elite level. The VO2max of severely injured athletes often decreases following injury.

The file ACL.csv contains the following variables, for 20 professional soccer players who underwent anterior cruciate ligament (ACL) reconstruction surgery:

·        ID: the study ID number for the player

·        Pre: the player's VO2max measured after ACL injury but before the surgery

·        Post: the player's VO2max measured six months after the surgery

Assuming that this sample is representative of all players with ACL injuries requiring reconstruction surgery, estimate the amount by which an injured player's VO2max increases due to the surgery and six-month rehabilitation period.

A) What inferential procedure would you use to answer this question?

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