The proprietor of an internet travel company compiled the following data relating the annual profit of the firm to its annual advertising expenditure (both measured in thousands of dollars):

(a) Determine the equation of the least squares line.
(b) Plot the data and the least squares line. Estimate the profit when the annual advertising budget is $50,000.
(c) What about a $100,000 budget?

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Annual advertising 12 14 17 2 26 30 expenditure 60 70 90 100 100 120