Athletes competing in a triathlon participated in a study described in the paper “Myoglobinemia and Endurance Exercise” (American Journal of Sports Medicine [1984]: 113–118). The following data on finishing time x (in hours) and myoglobin level y (in nanograms per milliliter) were read from a scatterplot in the paper:

a. Obtain the equation of the least-squares line.

b. Interpret the value of b.

c. What happens if the line in Part (a) is used to predict the myoglobin level for a finishing time of 8 hr? Is this reasonable? Explain.

Transcribed Image Text:

X y X y X y 4.90 1590 5.40 905 5.60 540 4.70 1550 5.70 895 5.35 540 5.35 1360 6.00 910 5.75 440 5.22 895 6.20 700 5.35 380 5.20 865 6.10 675 6.00 300