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Mathematics, 11.05.2021 01:00 dixks

To survey clients at a massage-therapy spa, a researcher alphabetically lists all of the customers the spa had last month. The researcher sends a survey to the 13th person on the list (with the number 13 being randomly chosen), then surveys every 20th customer after that. Which sampling method was used? cluster sampling
simple random sampling
stratified random sampling
systematic random sampling

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