A study was made by a retail merchant to determine the
Chapter , Problem 7.9(choose chapter or problem)
A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. Advertising Costs ($) Sales ($) 40 385 20 400 25 395 20 365 30 475 50 440 40 490 20 420 50 560 40 525 25 480 50 510 (a) Plot a scatter diagram. (b) Find the equation of the regression line to predict weekly sales from advertising expenditures. (c) Estimate the weekly sales when advertising costs are $35. (d) Plot the residuals versus advertising costs. Comment.
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