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Complete parts​ (a) through​ (h) for the data below. x 20 30 40 50 60 y...

Complete parts​ (a) through​ (h) for the data below. x 20 30 40 50 60 y 78 75 70 64 50 ​(d) By​ hand, determine the​ least-squares regression line. ModifyingAbove y with caretequals nothingxplusleft parenthesis nothing right parenthesis ​(Round to three decimal places as​ needed.)

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