Q1: what does the efficient frontier represents?

Q2: how do we estimate the return and standard deviation of a newly built portfolio from analyzing the stocks in that portfolio?

Q3: in the regression equation, what is meant by a regression that has an R-square with 0.95 and how does it compare with a regression with a R-square of 0.30?

Q4: why do we use adjusted beta?

Q5: what is the information ratio and why do we use it?