Answer: chief executive
Explanation:
The chairmen of all the Panchayat Samitis under the district are the ex officio members of Zila Parishad
All decisions involve trade-offs. Trade offs are the alternatives one gives up whenever one chooses one course of action leaving out out all other alternative courses of action.
Trade-offs are practically found in all economic decisions. For instance, when one chooses to take a special cup of cappuccino for $330, this excludes spending this amount of cash on tea or fruit juice. When you choose to buy an expensive piece of art, you will have to spend more money towards maintenance and security of the painting. If you decide to work in a far-off city due to better pay there, you spend less time with family and friends in your hometown.
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.
