β1=0 e5.1 from stock and watson 3rd edition introduction to econometrics
Using the data set CPS08 described  run a regression of average hourly earnings (AHE) on Age and carry out the following exercises.

a) Is the estimated regression slope coefficient statistically significant? That is, can you reject the null hypothesis Ho: beta 1 = 0
Versus a two side alternative at the 10%, 5% or 1% significance level? What is the p-value associated with coefficient's t-statistic?

b) Construct a 95% confidence interval for the slope coefficient.

c) Repeat (a) using only the data for high school graduates

d) Repeat (a) using only the data for college graduates

e) Is the effect of age on earnings different for high school graduates than college graduates? Explain