Question: A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. 1. Plot a scatter diagram. 2. Find

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

1. Plot a scatter diagram.

2. Find the equation of the regression line to predict weekly sales from advertising expenditures.

3. Estimate the weekly sales when advertising costs are $35.

4. Plot the residuals versus advertising costs. Comment.

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