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A supermarket chain is interested in knowing the factors that affect consumers' frequency of purchase, as well as the number of products purchased, and the average monthly spend made at the store. To do this, it decides to carry out a personal survey that will be administered to customers on the way out of the supermarket. An advantage of this information collection system is:a) The high rate of answersb) It is an economical technique.It allows the researcher to interview many people in a short time d) None of the above

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