Torsion during hip external ro

Torsion during hip external rotation (ER) and extension may be responsible for certain kinds of injuries in golfers and other athletes. The article “Hip Rotational Velocities During the Full Golf Swing” (J. of Sports Sci. and Med., 2009: 296–299) reported on a study in which peak ER velocity and peak IR (internal rotation) velocity (both in deg ? sec21 ) were determined for a sample of 15 female collegiate golfers during their swings. The following data was supplied by the article’s authors:

a. Is it plausible that the differences came from a normally distributed population?

b. Estimate the true average difference in peak ER and IR velocities in a way that conveys information about reliability and precision. Interpret the resulting estimate.

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