Access the data about heart rates and lactate concentrations, which are available at MyMathLab and at the Pearson Downloadable Student Resources for Math & Stats website. During intense exercise, the body produces lactate. In a 2013 study, female soccer players walked and ran on a treadmill at various levels of intensity and their heart rates and lactate concentrations in their bloodstreams were recorded. Let y be the lactate concentration (in millimole per liter) for a player with heart rate x beats per minute.
a. Construct a scatterplot.
b. Is the association positive, negative, or neither? What does it mean in this situation? Why does it make sense?
c. Find a regression equation.
d. In part (b), you described the direction of the association. Now describe the three other characteristics of the association. Compute and interpret an appropriate correlation coefficient as part of your analysis.
e. What is the base b of your model  = abx? What does it mean in this situation?
f. Find the change in the predicted lactate concentration for a heart rate that increases from 140 to 141 beats per minute. Do the same for a heart rate that increases from 160 to 161 beats per minute. Which result is greater? How does this relate to your response to part (e)?