The size of the population is 120 shoppers while the size of the sample is 29.
Population is the total amount of people or living things or things from which a survey or research is carried out. Meanwhile the sample is a portion of the population.
From the given question, the total number of shoppers is 120 and as such it is the population while the sample is 29 people being surveyed.
Read more about Population and Sample at; https://brainly.com/question/7301139
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