Problem 627 Air pollution control specialists in southern Ca

Problem 6-27

Air pollution control specialists in southern California monitor the amount of ozone, carbon dioxide, and nitrogen dioxide in the air on an hourly basis. The hourly time series data exhibit seasonality, with the levels of pollutants showing patterns that vary over the hours in the day. On July 15, 16, and 17, the following levels of nitrogen dioxide were observed for the 12 hours from 6:00 A.M. to 6:00 P.M.

July 15: 25   28   35   50   60   60   40   35   30   25   25   20

July 16: 28   30   35   48   60   65   50   40   35   25   20   20

July 17: 35   42   45   70   72   75   60   45   40   25   25   25

a. Choose the correct time series plot.

c. Using the equation developed in part (b), compute estimates of the levels of nitrogen dioxide for July 18. If required, round your answers to three decimal places.

(i)
(ii)
(iii)
(iv)

Solution

iv) th plot

In each year in the level of Nitrogen Oxide increases upto 11am-12 pm and then decreases.

Regression Equation

Levels of Nitrogen = 21.67 + 7.67 Hour1 + 11.67 Hour2 + 16.67 Hour3 + 34.33 Hour4
+ 42.33 Hour5 + 45.00 Hour6 + 28.33 Hour7 + 18.33 Hour8 + 13.33 Hour9
+ 3.33 Hour10 + 1.67 Hour11