(12pts) An experiment was conducted to examine the effect of age
on heart rate when a person is subjected to a specific amount of
exercise. Ten male subjects were randomly selected from four age
groups: 10-19, 20-39, 40-59, and 60-69. Each subject walked on a
treadmill at a fixed grade for a period of 12 minutes, and the
increase in heart rate, the difference before and after exercise,
was recorded (in beats per minute). Answer the questions based on
the...