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Queuing theory is the process of determining the most efficient and effective way to move people or goods through a line in the most economical manner, keeping waiting times to a minimum.
Simulation is a model that uses mathematical expressions and logical relationships to compute the value of the outputs. It is designed to model a real situation or system using controllable or probabilistic inputs.
Statistical sampling is used to calculate the condition of a population based on a sample from that population.
Time series analysis is used to measure the changes in the quantity of something over a period of time. Time series analysis would be an appropriate technique to use as it involves past experience.