Physiotherapy suppose a new medicine to help patients, Ask an Expert

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Physiotherapy

Suppose a new medicine to help patients suffering from arthritis was developed and tested. Patients voluntarily entered the study and were randomly assigned either the new medicine or physiotherapy.

Suppose a larger percentage of those using the new medicine reported relief from joint pain.

a. Can we generalize widely to a large group? Why or why not?

b. Can we infer causality? Why or why not?

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