Using data from the Current Population Survey, you estimate the following relationship between average hourly earnings (ahe)and the number of years of education (educ): 
= -4.58 + 1.71 educ
The heteroskedasticity-robust standard error on the slope is (0.03). Calculate the 95% confidence interval for the slope. Repeat the exercise using the 90% and then the 99% confidence interval. Can you reject the null hypothesis that the slope coefficient is zero in the population?
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