A chain of photography and electronics stores created a Web site to promote its photography lessons. The number of weekly visitors grew steadily, at a rate of about 300 new visitors each week. This timeplot shows the counts of unique visitors over the last 33 weeks.To describe the growth, an analyst used a linear time trend and estimated the equation to beÅ·t = 666 + 294 twith t = 1 denoting the first week, t = 2 the second, and...