模型一：y=a+b*log(x)+uR-squared=0.061329
Adjusted R-squared 0.030040

模型二：y=a+b*x+c*x^2+u

R-squared 0.148525
Adjusted R-squared 0.089803

Stating the null and alternative hypotheses of the F test for the significance of
the regression, conduct the test at the 10% level using the F statistic reported
above and interpret the results.