You know you can search up our population (which I'm guessing is the U.S.) and find Canada's population, then subtract Canada's population from our population (you can use a calculator if your teacher allows)
I don't want to give the answer because I really don't know, but this is just a way on how you can find out the answer.
hope this helps :)
The correct answer is D) Supplying Currency to banks
The Federal Reserve is in charge of monetary policy, meaning policy related to the money supply, rather than fiscal policy, such as government spending and tax collection. Monetary supply responsibilities involve determining what amount of currency to supply to banks, usually through the form of the interest rate.
The experimental units are what you apply the treatments to. In this experiment it would be the subjects or the customers in this situation since they will be treatment (either standing at their regular height or squatting to meet the eye level which could affect the amount of tip they give). An example of randomization can be numbering each table in the restaurant and picking them out of a hat and going to that table that you randomly chose and imposing the treatment on the customers there. Because tips depend on the income of the customers and how much they are willing to give for their meal. If not even income some people are willing to give despite how much money they make so their tips may higher than the wealthy crowd. Other factors the experimenters may not be able to control is the mood of the customers as well isn't it more likely if someone is enjoying their time to give more to the server despite the service the waiter.
