The office manager at a real estate firm makes a pot of coffee every morning. The time before it runs out, y, in hours depends on the number of persons working inside that day, x. Suppose that the pairs of ( x, y) values from six days are:
(a) Plot the scatter diagram.
(b) Calculate ,Sxy, and Syy .

(d) Determine the fitted line and draw the line on the scatter diagram.

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a) and β- Ao and A,