Researchers tested a new water-filtration device to reduce gastrointestinal illness in two comparable towns. Town 11 received the new filtration system installed on household taps, while Town 22 continued using its existing filters. Health officials recorded the proportion of residents reporting gastrointestinal symptoms over six months. What are the treatments?

Treatment 11: New household filtration systemTreatment 22: Existing filtration system

Treatment 11: Having gastrointestinal symptomsTreatment 22: Not having symptoms

Treatment 11: Urban residentsTreatment 22: Rural residents

Treatment 11: season 11 dataTreatment 22: season 22 data

Researchers tested a new water-filtration device to reduce gastro...

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