The following data set shows the weekly advertising expenditure and sales of 12 retail merchants selling face masks. Cost Sales 40 385 20 400 25 395 20 365 30 475 50 440 40 490 20 420 50 560 40 525 25 480 50 510 1. Plot a scatter diagram. Does it appear that there is a linear relationship between advertising cost and sales? Why or why not? 2. Compute the correlation coefficient. (Round of to 4 decimal places.) 3. Interpret the computed correlation coefficient.

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