7. (18 pts) A "handbook" of technical indicators contains many popular formulas that can be used for stock trading, such as moving average crossovers, put/call ratios, and trin statistics. For each, it provides an example of a particular time period and a particular stock where that technical strategy would have provided good returns. a) Do you think this handbook provides useful information for investors? Briefly explain why or why not. b) Does this handbook's evidence contradict the efficient markets hypothesis? Briefly explain why or why not.