The level of cretaine phosphokinase (CPK) in blood samples measures the amount of muscle damage for athletes. At Jock State University, the level of CPK was determined for each of 25 football players and 15 soccer players before and after practice. The two groups of athletes are trained independently. The data summary is as follows : For football players: n=25 Before Practice After Practice Difference (Before-After) Mean 254.73 225.6 29.13 Standard deviation 115.5 132.6 21.00 For soccer players: n=15 Before Practice After Practice Difference (Before-After) Mean 177.1 173.8 3.3 Standard deviation 60.7 64.4 6.88 Assume that all the data above are normal, use the information above to answer problem (7) Construct a 95% Confidence Interval for the difference in mean CPK values for football players BEFORE and AFTER exercises.
The level of cretaine phosphokinase (CPK) in blood samples measures the amount of muscle damage for athletes. At Jock State University, the level of CPK was determined for each of 25 football players and 15 soccer players before and after practice. The two groups of athletes are trained independently. The data summary is as follows :
For football players:
|
n=25 |
Before Practice |
After Practice |
Difference (Before-After) |
|
|
254.73 |
225.6 |
29.13 |
|
Standard deviation |
115.5 |
132.6 |
21.00 |
For soccer players:
|
n=15 |
Before Practice |
After Practice |
Difference (Before-After) |
|
Mean |
177.1 |
173.8 |
3.3 |
|
Standard deviation |
60.7 |
64.4 |
6.88 |
Assume that all the data above are normal, use the information above to answer problem
(7) Construct a 95% Confidence Interval for the difference in mean CPK values for football players BEFORE and AFTER exercises.
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