QUESTION - 3 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 pm: A. Construct a time series plot. What type of pattern exists in the data? B. Use a multiple linear regression model with dummy variables as follows to develop an equation to account for seasonal effects in the data: Hourl = 1 if the reading was made between 6:00 a.m. and 7:00 a.m., 0 otherwise Hour2 = 1 if the reading was made between 7:00 a.m. and 8:00 a.m., 0 otherwise