Suppose market is weak form efficient. Can you expect to earn excess returns if you make trades based on:

1. an analysts forecasts about future companys earnings?
2. rumours about the takeover of a firm believed to come from internal sources?
3. a companys announcements of a successful prototype launch?
4. information about price behaviour gained via technical analysis?
5. information about price behaviour gained via fundamental analysis of public information?

For every case you need to explain your decision.