BUS 660 WEEK 3 SOLUTION 4.19

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:
past 12 years, the following data have been obtained:
              NUMBER
             OF TOURISTS         RIDERSHIP
YEAR   (1,000,000s)             (100,000s)
1                   7                                15
2                   2                                10
3                  6                                13
4                  4                                15
5                14                                 25
6                15                                 27
7                16                                 24
8                12                                 20
9                14                                 27
10              20                                 44
11             15                                  34
12              7                                 17
(a) Plot these data and determine whether a linear
model is reasonable.
(b) Develop a regression model.
(c) What is expected ridership if 10 million tourists
visit the city?
(d) If there are no tourists at all, explain the predicted
ridership.