Resistance training is a popular form of conditioning aimed at enhancing sports

Question

Resistance training is a popular form of conditioning aimed at enhancing sports performance and is widely used among high school, college, and professional athletes, although its use for younger athletes is controversial. A random sample of 4,111 patients between the ages of 8 and 30 admitted to U.S. emergency rooms with the injury code "weight-lifting" was obtained. These injuries were classified as "accidental" if caused by dropped weight or improper equipment use. The patients were also classified into the four age categories 8 to 13, 14 to 18, 19 to 22, and 23 to 30 years. Here is a two-way table of the results. Age Accidental Not Accidenta Total 8-13 14-18 19-22 23-30 Total 291 657 239 363 1,550 106 914 533 1008 2,561 397 1,571 772 1,371 4,111 Calculate percentages that describe the nature of the relationship between age and whether the weight-lifting injuries were accidental or not. (Round your answers to one decimal place.) Age 8-13 14-18 19-22 23-30 Accidental Not Accidental Give a brief summary in words. It appears that the percent of weight-lifting injuries classified as accidental decreases as the patient gets older.

Explanation / Answer

The percentages for the given frequencies here could be computed as:

Age Accidental Not Accidental 8 - 13 291 / 1550 = 18.8% 106/ 2561 = 4.1% 14 - 18 657 / 1550 = 42.4% 914/ 2561 = 35.7% 19 - 22 239 / 1550 = 15.4% 533/ 2561 = 20.8% 23 - 30 363 / 1550 = 23.4% 1008/ 2561 = 39.4%

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