National health care spending: The following table shows national health care costs, measured in billions of dollars. a. Plot the natural logarithm of the data. Does it appear that the data on health...

National health care spending: The following table shows national health care costs, measured in billions of dollars.

a. Plot the natural logarithm of the data. Does it appear that the data on health care spending can be appropriately modeled by an exponential function?

b. Find the equation of the regression line for the logarithm of the data and add its graph to the plot in part a.

c. By what percent per year were national health care costs increasing during the period from 1960 through 2000?