Determine the regression equation. Determine the number of kilowatt-hours, in th

Question

Determine the regression equation. Determine the number of kilowatt-hours, in thousands, for a six-room house. Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and the Y column shows the value of sales ($ thousands) last month for each client sampled. Determine the regression equation. Determine the estimated sales if 40 contacts are made. A recent article in BusinessWeek listed the "Best Small Companies." We are interested in the current results of the companies1 sales and earnings. A random sample of 12 companies was selected and the sales and earnings, in millions of dollars, are reported below. Let sales be the independent variable and earnings be the dependent variable

Explanation / Answer

16) as asked we just have to find the regreesion line

that is part A)

a)

XY and X2 as it was done in the table below.

sum of every column:

X=334 , Y=611 , XY=26584 , X2=13970

therefore using the formula for a and b

we will get a = -12.201

and b = 2.195

therefore regression equation = y = -12.201 + 2.195x

X Y XY XX 14 24 336 196 12 14 168 144 20 28 560 400 16 30 480 256 46 80 3680 2116 23 30 690 529 48 90 4320 2304 50 85 4250 2500 55 120 6600 3025 50 110 5500 2500

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