the risk versus return trade off graph.

Each answer has to be 6 sentences long atleast.
Question 1
How does Altman’s Z work in predicting bankruptcy? How could we test it to see if it still makes good predictions today?
Question 2
I attached the graph in the documents
Given Exhibit 8.4, which would have a higher expected return, a share of stock of a risky company or a U.S. Treasury bond?
A risk versus return trade off graph. The graph plots return on the vertical axis and risk on the horizontal axis. The lower left section of the first quadrant indicates the low risk low return investments and the top right section indicates high risk high return. The investments in the lower quadrant are: treasury bill bonds, certificate of deposit of banks, high quality corporate bonds (B A A or above). The investments in the upper section of the quadrant are: low quality corporate bonds, stock market index, individual stocks and finally lottery ticket.