- 2 A Study Was Made By A Retail Merchant To Determine The Relation Between Weekly Advertising Expenditures And Sales Ad 1 (24.27 KiB) Viewed 22 times
#2 A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. Ad
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#2 A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. Ad
#2 A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. Advertising 40 20 25 20 30 50 40 20 50 40 25 costs ($) Sales ($) 385 400 395 365 475 440 490 420 560 525 480 50 510 (a) Plot a scatter diagram. Does it appear that a simple linear regression will be a suitable model? (b) Find the equation of the regression line to predict weekly sales from adverting expenditures. (c) Plot the regression line on the graph with the data. (d) Test the hypotheses Ho: B1 = 0 vs He: B1 # 0 using a = 0.05. Comment about the model. (e) Estimate the weekly sales when advertising costs are $35. (f) Compute R2 and interpret it. (g) Plot the residuals versus advertising costs. Comments.
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