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Collecting supermarket sales data only on Tuesdays is an example of sampling bias in marketing research because the data are collected from a single day of the week rather than across all operating days. Consumer buying behaviour varies from day to day due to factors such as work schedules, promotional offers, salary payment cycles, weekends, holidays, and seasonal events. Therefore, Tuesday sales may not _________ ___ ______ ____ ________ ____ ____ _____ _______.
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