Increasing joint extension is one goal of post-surgical rehabilitation therapy. In a study to evaluate the effect of therapy which uses ultrasound and stretching, passive knee extension was measured after each treatment. Passive knee extension data is given (in degrees) for a sample of 10 therapy participants.

66 43 62 55 61 61 47 79 53 54

Compute the following:

a) Mean

b) Median

c) Range

d) Standard Deviation

e) What would be the z-score for a patient that experienced a knee extension of 55 degrees?

f) Should a therapist be concerned about a patient who experienced a knee extension of less than 50 degrees? Why?