A therаpist dоes а cоrrelаtiоnal analysis to measure the strength of the relationship between two types of pulse oximeters during a bicycle exercise under hypoxic conditions. The investigator found measured arterial oxyhemoglobin saturation (%HbO2) levels to have a correlation of r=0.89 at high saturation, but only r=0.68 at low saturation levels. The results of this study suggest: