10. Creatine Phosphokinase (CK) is an enzyme associated with muscle and brain fu

Question

10. Creatine Phosphokinase (CK) is an enzyme associated with muscle and brain function. In an effort to evaluate the "fight readiness" of soldiers, a team of army health professionals are reviewing health and fitness data measured on its troops. Listed below are CK levels (in units/liter) of 31 randomly chosen soldiers. Compute the 95% confidence interval of mean CK for the population of US Army soldiers. Creatine Phosphokinase for 31 Soldiers 121 25 83 110 60 101 58 95 82 123 67 113 78 84 145 100 70 93 118 119 57 64 151 48 92 62 104 139 201 68 95

Explanation / Answer

Standard error of the mean = SEM = S/N = 6.403

t(, N-1) = 2.042

Confidence interval = m +/- (t(, N-1)*SEM)

Mean = 94.387

Lower bound: 81.31

Upper bound: 107.46

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