Lowe’s Companies, Inc., is a home improvement company offering a range of products for maintenance, repair, remodeling, and decorating. During the recovery phase since the financial crisis of 2008, Lowe’s has enjoyed a steady growth in revenue. The following table contains a portion of quarterly data on Lowe’s revenue (in $ millions) with its fiscal year concluding at the end of January. 

a. Estimate and interpret the linear trend model with seasonal dummy variables. 

b. Use the estimated model to forecast Lowe’s revenue for the fourth quarter of 2018.

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Year 2010 2010 ⠀ 2018 Quarter 1 2 1 3 Revenue 12,388 14,361 ⠀ 17,415