Let x be the age of a licensed driver in years. Let y be the percentage of all fatal accidents (for a given age) due to failure to yield the right of way. For example, the first data pair states that...

(a) Draw a scatter diagram displaying the data.


(b) Verify the given sums Σx, Σy, Σx
², Σy
², Σxy, and the value of the sample correlation coefficientr. (Round your value forr to three decimal places.)

Σx =
Σy =
Σx 2 =
Σy 2 =
Σxy =
r =

(c) Find x, and y. Then find the equation of the least-squares line  =a +bx. (Round your answers for x and y to two decimal places. Round your answers fora andb to three decimal places.)

x	=
y	=
	=	+x

(d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line.













(e) Find the value of the coefficient of determinationr
². What percentage of the variation iny can beexplained by the corresponding variation inx and the least-squares line? What percentage isunexplained? (Round your answer forr
² to three decimal places. Round your answers for the percentages to one decimal place.)

r 2 =
explained	%
unexplained	%

(f) Predict the percentage of all fatal accidents due to failing to yield the right of way for 75-year-olds. (Round your answer to two decimal places.)