10.41 Runners and Cyclists II Refer to Exercise 10.27. In addition to the compartment pressures, the level of creatine phosphokinase (CPK) in blood samples, a measure of muscle damage, was determined for each of 10 runners and 10 cyclists before and after exercise. The data summary CPK values in units/ litre is as follows:

a. Test for a significant difference in mean CPK values for runners and cyclists before exercise under the assumption that o; use a = 0.05. Find a 95% confidence interval estimate for the corresponding difference in means.

b. Test for a significant difference in mean CPK values for runners and cyclists after exercise under the assumption that o; use a = 0.05. Find a 95% confidence interval estimate for the corresponding difference in means.

c. Test for a significant difference in mean CPK values for runners before and after exercise.

d. Find a 95% confidence interval estimate for the difference in mean CPK values for cyclists before and after exercise. Does your estimate indicate that there is no significant difference in mean CPK levels for cyclists before and after exercise?

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Runners Standard Cyclists Standard Condition Mean Deviation Mean Deviation Before exercise 255.63 115.48 173.8 60.69 After exercise 284.75 132.64 177.1 64.53 Difference 29.13 21.01 3.3 6.85