Question: A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales (a) Plot a scatter diagram. (b) Find

A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales

(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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