Bus and subway ridership in Washington D. C. during the summer months is believed to be heavily tied to the number of tourists visiting the city. During the past 12 years, the following data have been obtained:

Number of Tourists (in millions)	7	2	6	4	14	15	16	12	14	20	15	7
Ridership (in 100,000)	15	10	13	15	25	27	24	20	27	44	34	17

a) Develop a linear regression model that would predict bus and subway ridership based on the number of tourists.

b) Based on your model, predict the bus and subway ridership if there are eight million tourists in the city.

c) Find the coefficient of determination and correlation coefficient between the two variables.