A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data were recorded: Advertising Costs ($) Sales ($) 40 385 20 400 25 395 20 365 30 475 50 440 40 490 20 420 50 560 40 525 480 25 50 510 a. Find the equation of the regression line to predict weekly sales from the advertising expenditures. b. Determine how much will be the sales when advertising costs are 28, 42 and 48 Find the correlation coefficient. (Explain your answer) C.

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