Increasing joint extension is one goal of athletic trainers. In a study to investigate the effect of therapy that uses ultrasound and stretching (Trae Tashiro, Masters Thesis, University of Virginia, 2004), passive knee extension was measured after treatment. Passive knee extension (in degrees) is given for each of 10 study participants.
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Which would you choose to describe center and spread— the mean and standard deviation or the median and interquartile range? Justify your choice.