13.22 “There is a high correlation between how frequently skiers have their bindings tested and the incidence of lower-leg injuries, according to researchers at the Rochester Institute of Technology. To make sure your bindings release properly when you begin to fall, you should have them serviced by a ski mechanic every 15 to 30 ski days or at least at the start of each ski season” (University of California, Berkeley, “Wellness Letter,” February 1991). Explain what two variables are discussed in this statement, and interpret the

“high correlation” mentioned.