In a random sample of large cities around the world, the ozone level (in parts per million) and the population (in millions) were measured. Fitting the simple linear regression model gave the estimated regression equation: ozone⌢ = 8.89 + 16.6 population. (pretend it's a hat) Interpret b = 16.6. For each additional
million people, the predicted ozone level increases
ppm.

Rascoville is a large city with a population of 3 million people. What is the average ozone level?

If the ozone level is approximately 142 ppm, what is the approximate population in millions (round to the nearest million)?