Coefficients:
                  Estimate Std. Error t value            Pr(>|t|)
(Intercept)       -9.92029    0.38053   -26.1 <0.0000000000000002 ***
edu_index_percent  0.10345    0.00592    17.5 <0.0000000000000002 ***
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 1.33 on 167 degrees of freedom
Multiple R-squared:  0.646, Adjusted R-squared:  0.644
F-statistic:  305 on 1 and 167 DF,  p-value: <0.0000000000000002