Quartiles are groups with different confidence interval. Based on the graphs, describe the overall trend of Option volatility, the influence of good/bad
news on different Quartiles and the change trend of the same Quartile facing different news. Explain why during the period from 20 days to 0 days
before the event, the volatility increased. Then explain why during the 20 days after the event, the volatility decreased and remained stable. What
caused this, what is the psychology of people, etc.