Question: Examine the provided monthly time series data for total U.S. retail sales of building materials (which includes retail sales of building materials, hardware and garden

Examine the provided monthly time series data for total U.S. retail sales of building materials (which includes retail sales of building materials, hardware and garden supply stores, and mobile home dealers). The data are in the file P2_39.XLS.

a. Is there an observable trend in these data? That is, do the values of the series tend to increase or decrease over time?

b. Is there a seasonal pattern in these data? If so, how do you explain this seasonal pattern?

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