Football player heart rates: For a group of 22 college football players, the mea
ID: 2955554 • Letter: F
Question
Football player heart rates: For a group of 22 college football players, the mean heart rate after a morning workout session was 86 beats per minute and the standard deviation was 5. Find the 90% confidence interval of the true mean for all college football players after a workout session. If a coach did not want to work his team beyond its capacity, what would be the maximum value he should use for the mean number of hearbeats per minute? Football player heart rates: For a group of 22 college football players, the mean heart rate after a morning workout session was 86 beats per minute and the standard deviation was 5. Find the 90% confidence interval of the true mean for all college football players after a workout session. If a coach did not want to work his team beyond its capacity, what would be the maximum value he should use for the mean number of hearbeats per minute?Explanation / Answer
Formula is xbar +- t* s/n^0.5 Here xbar= 86 t* = 1.721 (from t table with degrees of freedom 21 (n-1)). s=5 n=22 86+- 1.721 * 5/22^0.5 86+- 1.834= (84.166, 87.834) 88 (rounded) is the maximum the coach should consider.