The table shows the combined city and highway fuel efficiency (in miles per gallon gasoline equivalent) and top speeds (in miles per hour) for nine hybrid and electric cars. The regression equation is ŷ = -0.465x + 139.433.

Use the data to 

(a) Find the coefficient of determination r² and interpret the result, and

(b) find the standard error of estimate s_e and interpret the result.

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95 107 116 120 105 Fuel efficiency, x Top speed, y 114 118 68 84 105 92 80 101 103 78 85 92 88