The U.S. Army reports that muscular fatigue in the trigger finger often hinders firing during pistol...

Transcribed Image Text:

The U.S. Army reports that muscular fatigue in the trigger finger often hinders firing during pistol shooting training. A study designed to analyze finger strength and the effects of muscle fatigue on the ability to shoot a pistol was published. One variable of interest was maximum voluntary isometric contraction (MVIC) of the index finger-a standardized method for measuring (in Newtons) muscle strength. In the experiment, soldiers fired 60 pistol rounds each session, for six consecutive shooting sessions. At rest, expert male shooters were found to have a mean MVIC of 160.7 N, with a standard deviation of 19.6 N. At the end of the repeated shooting sessions, the shooters lost index finger strength, with a mean MVIC of 133.4 N and a standard deviation of 19.6 N. Assume that the distribution of MVIC strength scores is approximately mound-shaped and symmetric. Complete parts a through c below. a. Give a range of MVIC values that contain about 95% the index finger strength values for male shooters at rest. About 95% of the male shooters at rest had a finger strength between 121.5 and 199.9. (Type integers or decimals. Do not round. Use ascending order.) b. Give a range of MVIC values that contain about 95% the index finger strength values for male shooters after six consecutive shooting sessions. About 95% of the male shooters after six consecutive shooting sessions had a finger strength between 94.2 and 172.6. (Type integers or decimals. Do not round. Use ascending order.) c. What proportion of male shooters after six consecutive shooting sessions have MVIC strength scores below 94.2? About (Type an integer or a decimal. Do not round.) The U.S. Army reports that muscular fatigue in the trigger finger often hinders firing during pistol shooting training. A study designed to analyze finger strength and the effects of muscle fatigue on the ability to shoot a pistol was published. One variable of interest was maximum voluntary isometric contraction (MVIC) of the index finger-a standardized method for measuring (in Newtons) muscle strength. In the experiment, soldiers fired 60 pistol rounds each session, for six consecutive shooting sessions. At rest, expert male shooters were found to have a mean MVIC of 160.7 N, with a standard deviation of 19.6 N. At the end of the repeated shooting sessions, the shooters lost index finger strength, with a mean MVIC of 133.4 N and a standard deviation of 19.6 N. Assume that the distribution of MVIC strength scores is approximately mound-shaped and symmetric. Complete parts a through c below. a. Give a range of MVIC values that contain about 95% the index finger strength values for male shooters at rest. About 95% of the male shooters at rest had a finger strength between 121.5 and 199.9. (Type integers or decimals. Do not round. Use ascending order.) b. Give a range of MVIC values that contain about 95% the index finger strength values for male shooters after six consecutive shooting sessions. About 95% of the male shooters after six consecutive shooting sessions had a finger strength between 94.2 and 172.6. (Type integers or decimals. Do not round. Use ascending order.) c. What proportion of male shooters after six consecutive shooting sessions have MVIC strength scores below 94.2? About (Type an integer or a decimal. Do not round.)