Question: A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data were recorded:(a) Plot a

A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data were recorded:(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 $35.(d) Plot the residuals versus advertising costs.Comment Advertising Costs ($) 40 Sales ($) 385 20 400 25 395 20

Advertising Costs ($) 40 Sales ($) 385 20 400 25 395 20 365 30 475 50 440 40 490 20 420 50 560 40 525 25 480 50 510

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