II. PROBLEM SOLVING. Solve the following problems. For computations, show all pertinent solutions. No immediate rounding. Round off all final answers to four decimal places. The following data set shows the weekly advertising expenditure and sales of 12 retail merchants selling face masks. Sales ($) 385 400 395 365 475 440 490 420 560 525 480 70 510 1. Plot a scatter diagram. Does it appear that there is a linear relationship between advertising cost and sales? Why or why not? Advertising cost ($) 60 40 45 40 50 70 60 40 70 60 45 2. Compute the correlation coefficient. Interpret this value in terms of strength and direction of the relationship, if there is any.

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