Dr. johnson's study on the effectiveness of a new medication for anxiety demonstrated positive results. before assuming the medication is effective, it would be best to

Before assuming the medication is effective, it would be best to replicate the study.

Explanation:

Every drug that will be launched in the market goes through several research and testing stages until it is approved by the competent agency of the manufacturer's country of origin. These researches and tests are performed to prove the efficacy of the product and to ensure that the drug does not cause any harmful reaction to the people who used it. These tests are repeated several times to ensure that everything is correct regarding the medicine.

For this reason, if Dr. Johnson's study on the effectiveness of a new anxiety drug has shown positive results. Before assuming that the medication is effective, it would be better to perform other tests that prove the positive result previously found.