Oakland passengers. The scatterplot below shows the number of passengers departing from Oakland (CA)

airport month by month since the start of 1997. Time is shown as years since 1990, with fractional years used to represent each month. (Thus, June of 1997 is 7.5—halfway through the 7th year after 1990.)

www.oaklandairport.com

Here’s a regression and the residuals plot:

a) Interpret the slope and intercept of the model.

b) What does the value of say about the model?

c) Interpret in this context.

d) Would you use this model to predict the numbers of passengers in 2010 1Years Since 1990 = 202?Explain.

e) There’s a point near the middle of this time span with a large negative residual. Can you explain this outlier?

Passengers 1,200,000 1,000,000- 800,000 7.5 10.0 12.5 Years Since 1990 15.0