The expected count of 14- to 18-year-olds whose injuries were classified as “acc

Question

The expected count of 14- to 18-year-olds whose injuries were classified as “accidental” is about

. (25.23) 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 4111 patients between the ages of 8 and 30 admitted to U.S. emergency rooms with the injury code “weightlifting” 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 “8–13,” “14–18,” “19–22,” and “23–30.” Here is a two-way table of the results:

The expected count of 14- to 18-year-olds whose injuries were classified as “accidental” is about

977.91. 593.09. 655.

Explanation / Answer

The expected count of 14- to 18-year-olds whose injuries were classified as “accidental” is about 655

Since from the table count of 14- to 18-year-olds whose injuries were classified as “accidental” is 655, which is a constant value and Expectation of a constant value is that constant.

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