An accurate assessment of oxygen consumption provides important information for determining energy expenditure requirements for physically demanding tasks. The paper €œOxygen Consumption During Fire Suppression: Error of Heart Rate Estimation€ (Ergonomics [1991]: 1469€“1474) reported on a study in which x = oxygen consumption (in milliliters per kilogram per minute) during a treadmill test was determined for a sample of 10 fire fighters. Then y = oxygen consumption at a comparable heart rate was measured for each of the 10 individuals while they performed a fire-suppression simulation. This resulted in the following data and scatterplot:

a. Does the scatterplot suggest an approximate linear relationship?
b. The investigators fit a least-squares line. The resulting Minitab output is given in the following:

Predict fire-simulation consumption when treadmill consumption is 40.
c. How effectively does a straight line summarize the relationship?
d. Delete the first observation, (51.3, 49.3), and calculate the new equation of the least-squares line and the value of r2. What do you conclude?

Transcribed Image Text:

Firefighter 51.3 34. 41.1 36.3 36.5 49.3 29.5 30.6 28.2 28.0 10 35.4 35.4 38.6 40.6 39.5 26.3 33.9 29.4 23.5 31.6 Firefighter 6 Fire-simulation consumption 50 40 30 20 Treadmill 35 42 49 consumption