The U.S. voting age populations (in millions) and the number of ballots cast (in millions) for the highest office in federal elections for nine nonpresidential election years are shown in the table. The equation of the regression line is ŷ = 0.276x + 18.881.

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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Voting age population, x 166.0 177.9 186.2 195.3 205.3 Ballots cast in federal 67.6 75.1 65.0 67.9 72.5 elections, y Voting age population, x 215.5 225.5 236.0 245.7 Ballots cast in federal 78.4 83.8 89.1 81.7 elections, y