Explain whether it would have been possible to perform one-tailed tests instead of two-tailed tests in Exercise 3.11. If you think that one-tailed tests are justified, perform them and state whether the use of a one-tailed test makes any difference.
Exercise 3.11
Perform a t test on the slope coefficient and the intercept of the educational attainment function fitted using your EAEF data set, and state your conclusions.