I just want the points so hope this helped ;)
The reason why surveying a different number of people or different population of people can possibly change the percentages that you calculated is because these surveys are simply "samples" of the general population as a whole, and are not exact in terms of their results given any random sample.
Answer:
The Feds can: 1. Open Market Operations; 2. Adjust the reserve requirement; 3. Adjust the discounting rate.
Explanation:
These can all be taken individually or in combination with one another.