Question

ur best saitbmission for each enie qton is used for your soore Do heavier cars really use more gasoline? Suppose a car is chosen at random, Let x be the weight of the car (in hundreds 2843 345 3 2125 1329 17 2114 Complete parts (a) through (e), given Σ" 296, Zy " 173, b. 11.672. Zy-4091, bys 5952, and r.-o Draw a scattor diagram displaying the data. Actions Vi Asi graphing tool (b) Verify the given sums Ex Ey, zzy, xy, and the value of the sample correlation coefficient r. (Round your value y-173 2x2 11872 P-0.895 (c) Find , and y. Then find the equation of the least-squares line y a + bx. (Round your answers for x and y to two de y a (d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line. 50 40

Answer 1

a) Scatter diagram is correct

b) the calculation table is given below:

c)

. 296

$\overline{Y} =\frac{1}{n}\sum Y =\frac{173}{8}=21.625\approx 21.63$

The least square line is

$\widehat{y}= 44.70+(-0.62)X$