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Consider the oil filter sales data shown in Exhibit 1.8 on page 7 in the textbook. The data are in the file named oilfilters. (a)

Consider the oil filter sales data shown in Exhibit 1.8 on page 7 in the textbook. The data are in the file named oilfilters.

(a) Fit an AR(1) model to this series. Is the estimate of the parameter significantly different from zero statistically?

(b) Display the sample ACF of the residuals from the AR(1) fitted model. Comment on the display.

Data is in

library(TSA)

data(oilfilters)

Solve with R

Exhibit1.8 Monthly Oil Filter Sales Exhibit1.8 Monthly Oil Filter Sales

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