Final answer:
A heart rate range of 70 to 130 beats per minute is a true expected reference range for a 6-year-old child, taking into account the natural variance in heart rate with age and activity level.
Step-by-step explanation:
The statement that a heart rate ranging 70 to 130 beats per minute is the expected reference range for a 6-year-old child is True. Heart rates (HRs) vary not only with exercise and fitness levels but also significantly with age. For instance, newborns can have resting HRs around 120 bpm, and this rate gradually decreases until reaching young adulthood. It is also important to note that during exercise, the HR in healthy young individuals may increase to around 150 bpm. Thus, the heart rate range for a 6-year-old can reasonably be expected to fall within 70 to 130 bpm, considering both resting and active states of the child.