The file P08_30.xlsx contains quarterly revenue for Nike for the years 1991 to 1998. It also contains quarterly

“indicator” variables Q1, Q2, and Q3. Here Q1 is 1 for the first quarter of a fiscal year (July–September)

and 0 otherwise. Q2 and Q3 are defined similarly for the second and third quarters of the fiscal year

(October–December and January–March). The

“Quarter #” variable is simply the chronological number of the quarter, 1 to