Question: is this an experiment or observational study?: (b) Same example as above, but they are now concerned that their might be systematic differences between two

is this an experiment or observational study?: (b) Same example as above, but they are now concerned that their might be systematic differences between two groups. To control for this they select 1000 customers who use the pharmacy and match each of them with a customer with similar characteristics, except they do not use the pharmacy. They still use data from the past 10 years to analyze the differences between the two groups

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